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78057940 = 22515125847
BaseRepresentation
bin1001010011100…
…01000111010100
312102212202100211
410221301013110
5124440323230
611425015204
71635324112
oct451610724
9172782324
1078057940
11400750a4
1222184504
131323043c
14a51cab2
156cbd42a
hex4a711d4

78057940 has 24 divisors (see below), whose sum is σ = 165013632. Its totient is φ = 31015200.

The previous prime is 78057919. The next prime is 78057977. The reversal of 78057940 is 4975087.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 78057893 and 78057902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9904 + ... + 15943.

It is an arithmetic number, because the mean of its divisors is an integer number (6875568).

Almost surely, 278057940 is an apocalyptic number.

It is an amenable number.

78057940 is an abundant number, since it is smaller than the sum of its proper divisors (86955692).

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

78057940 is a wasteful number, since it uses less digits than its factorization.

78057940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26007 (or 26005 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 78057940 is about 8835.0404639707. The cubic root of 78057940 is about 427.3716359357.

The spelling of 78057940 in words is "seventy-eight million, fifty-seven thousand, nine hundred forty".

Divisors: 1 2 4 5 10 20 151 302 604 755 1510 3020 25847 51694 103388 129235 258470 516940 3902897 7805794 15611588 19514485 39028970 78057940