3638864 has 20 divisors (see below), whose sum is σ = 7079904. Its totient is φ = 1811808.

The previous prime is 3638851. The next prime is 3638879. The reversal of 3638864 is 4688363.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7229 + ... + 7715.

Almost surely, 2^3638864 is an apocalyptic number.

It is an amenable number.

3638864 is a deficient number, since it is larger than the sum of its proper divisors (3441040).

3638864 is a wasteful number, since it uses less digits than its factorization.

3638864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962 (or 956 counting only the distinct ones).

The product of its digits is 82944, while the sum is 38.

The square root of 3638864 is about 1907.5806667085. The cubic root of 3638864 is about 153.8114293937.

The spelling of 3638864 in words is "three million, six hundred thirty-eight thousand, eight hundred sixty-four".