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18072828 = 2233167341
BaseRepresentation
bin100010011110…
…0010011111100
31021000012021000
41010330103330
514111312303
61443210300
7306421314
oct104742374
937005230
1018072828
11a224424
126076990
13398a1a7
142586444
1518beda3
hex113c4fc

18072828 has 24 divisors (see below), whose sum is σ = 46855760. Its totient is φ = 6024240.

The previous prime is 18072827. The next prime is 18072833. The reversal of 18072828 is 82827081.

It is a super-2 number, since 2×180728282 = 653254223835168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18072792 and 18072801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18072823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83563 + ... + 83778.

Almost surely, 218072828 is an apocalyptic number.

18072828 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18072828 is an abundant number, since it is smaller than the sum of its proper divisors (28782932).

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

18072828 is a wasteful number, since it uses less digits than its factorization.

18072828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167354 (or 167346 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 18072828 is about 4251.2148851828. The cubic root of 18072828 is about 262.4271144584.

The spelling of 18072828 in words is "eighteen million, seventy-two thousand, eight hundred twenty-eight".

Divisors: 1 2 3 4 6 9 12 18 27 36 54 108 167341 334682 502023 669364 1004046 1506069 2008092 3012138 4518207 6024276 9036414 18072828