18857664 has 112 divisors (see below), whose sum is σ = 63398400. Its totient is φ = 5384448.

The previous prime is 18857651. The next prime is 18857681. The reversal of 18857664 is 46675881.

It is a happy number.

18857664 is a `hidden beast` number, since 18 + 8 + 576 + 64 = 666.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×18857664² = 711222983073792, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11317 + ... + 12875.

Almost surely, 2^18857664 is an apocalyptic number.

18857664 is a gapful number since it is divisible by the number (14) 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 18857664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31699200).

18857664 is an abundant number, since it is smaller than the sum of its proper divisors (44540736).

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

18857664 is a wasteful number, since it uses less digits than its factorization.

18857664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587 (or 1571 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 18857664 is about 4342.5411915145. The cubic root of 18857664 is about 266.1721613364.

The spelling of 18857664 in words is "eighteen million, eight hundred fifty-seven thousand, six hundred sixty-four".