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18013258872 = 233472691821
BaseRepresentation
bin10000110001101011…
…001000010001111000
31201111101010100210000
4100301223020101320
5243342343240442
612135234353000
71205246113500
oct206153102170
951441110700
1018013258872
117704019004
1235a872b760
131910bc357b
14c2c4bca00
15706626d4c
hex431ac8478

18013258872 has 240 divisors, whose sum is σ = 58847686920. Its totient is φ = 5132937600.

The previous prime is 18013258847. The next prime is 18013258891. The reversal of 18013258872 is 27885231081.

18013258872 is a `hidden beast` number, since 180 + 1 + 325 + 88 + 72 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 21940222 + ... + 21941042.

Almost surely, 218013258872 is an apocalyptic number.

18013258872 is a gapful number since it is divisible by the number (12) 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 18013258872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29423843460).

18013258872 is an abundant number, since it is smaller than the sum of its proper divisors (40834428048).

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

18013258872 is a wasteful number, since it uses less digits than its factorization.

18013258872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1544 (or 1524 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The spelling of 18013258872 in words is "eighteen billion, thirteen million, two hundred fifty-eight thousand, eight hundred seventy-two".