18887664 has 40 divisors (see below), whose sum is σ = 49933312. Its totient is φ = 6148800.

The previous prime is 18887647. The next prime is 18887677. The reversal of 18887664 is 46678881.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2512 + ... + 6639.

Almost surely, 2^18887664 is an apocalyptic number.

It is an amenable number.

18887664 is an abundant number, since it is smaller than the sum of its proper divisors (31045648).

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

18887664 is a wasteful number, since it uses less digits than its factorization.

18887664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9205 (or 9199 counting only the distinct ones).

The product of its digits is 516096, while the sum is 48.

The square root of 18887664 is about 4345.9940174832. The cubic root of 18887664 is about 266.3132345563.

The spelling of 18887664 in words is "eighteen million, eight hundred eighty-seven thousand, six hundred sixty-four".