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78855396 = 223192109167
BaseRepresentation
bin1001011001100…
…11110011100100
312111101021021020
410230303303210
5130141333041
611454051140
71645155054
oct454636344
9174337236
1078855396
114056a254
12224a9ab0
131344c3c9
14a689564
156dc9866
hex4b33ce4

78855396 has 72 divisors (see below), whose sum is σ = 197144640. Its totient is φ = 24525504.

The previous prime is 78855391. The next prime is 78855451. The reversal of 78855396 is 69355887.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

Its product of digits (1814400) is a multiple of the sum of its prime divisors (300).

It is not an unprimeable number, because it can be changed into a prime (78855391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 472105 + ... + 472271.

It is an arithmetic number, because the mean of its divisors is an integer number (2738120).

Almost surely, 278855396 is an apocalyptic number.

78855396 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78855396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98572320).

78855396 is an abundant number, since it is smaller than the sum of its proper divisors (118289244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78855396 is a wasteful number, since it uses less digits than its factorization.

78855396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 300 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 51.

The square root of 78855396 is about 8880.0560809040. The cubic root of 78855396 is about 428.8220799803.

The spelling of 78855396 in words is "seventy-eight million, eight hundred fifty-five thousand, three hundred ninety-six".

Divisors: 1 2 3 4 6 12 19 38 57 76 109 114 167 218 228 327 334 361 436 501 654 668 722 1002 1083 1308 1444 2004 2071 2166 3173 4142 4332 6213 6346 8284 9519 12426 12692 18203 19038 24852 36406 38076 39349 54609 60287 72812 78698 109218 118047 120574 157396 180861 218436 236094 241148 345857 361722 472188 691714 723444 1037571 1383428 2075142 4150284 6571283 13142566 19713849 26285132 39427698 78855396