18087872 has 28 divisors (see below), whose sum is σ = 39157656. Its totient is φ = 8221440.

The previous prime is 18087871. The next prime is 18087877. The reversal of 18087872 is 27878081.

It is a super-2 number, since 2×18087872² = 654342226976768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18087871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12143 + ... + 13550.

Almost surely, 2^18087872 is an apocalyptic number.

It is an amenable number.

18087872 is an abundant number, since it is smaller than the sum of its proper divisors (21069784).

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

18087872 is a wasteful number, since it uses less digits than its factorization.

18087872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25716 (or 25706 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 41.

The square root of 18087872 is about 4252.9838936916. The cubic root of 18087872 is about 262.4999099017.

The spelling of 18087872 in words is "eighteen million, eighty-seven thousand, eight hundred seventy-two".