18875556 has 36 divisors (see below), whose sum is σ = 54530112. Its totient is φ = 5392944.

The previous prime is 18875551. The next prime is 18875557. The reversal of 18875556 is 65557881.

18875556 is a `hidden beast` number, since 18 + 87 + 5 + 556 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×18875556² = 712573228618272, which contains 22 as substring.

It is a zygodrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18875551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37200 + ... + 37703.

Almost surely, 2^18875556 is an apocalyptic number.

It is an amenable number.

18875556 is an abundant number, since it is smaller than the sum of its proper divisors (35654556).

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

18875556 is a wasteful number, since it uses less digits than its factorization.

18875556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74920 (or 74915 counting only the distinct ones).

The product of its digits is 336000, while the sum is 45.

The square root of 18875556 is about 4344.6007871840. The cubic root of 18875556 is about 266.2563153961.

The spelling of 18875556 in words is "eighteen million, eight hundred seventy-five thousand, five hundred fifty-six".