18775664 has 20 divisors (see below), whose sum is σ = 36734256. Its totient is φ = 9295872.

The previous prime is 18775661. The next prime is 18775681. The reversal of 18775664 is 46657781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18775661) 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, 4049 + ... + 7344.

Almost surely, 2^18775664 is an apocalyptic number.

It is an amenable number.

18775664 is a deficient number, since it is larger than the sum of its proper divisors (17958592).

18775664 is a wasteful number, since it uses less digits than its factorization.

18775664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11504 (or 11498 counting only the distinct ones).

The product of its digits is 282240, while the sum is 44.

The square root of 18775664 is about 4333.0894290333. The cubic root of 18775664 is about 265.7857962340.

The spelling of 18775664 in words is "eighteen million, seven hundred seventy-five thousand, six hundred sixty-four".