7638564 has 12 divisors (see below), whose sum is σ = 17823344. Its totient is φ = 2546184.

The previous prime is 7638557. The next prime is 7638569. The reversal of 7638564 is 4658367.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (7638569) 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, 318262 + ... + 318285.

Almost surely, 2^7638564 is an apocalyptic number.

It is an amenable number.

7638564 is an abundant number, since it is smaller than the sum of its proper divisors (10184780).

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

7638564 is a wasteful number, since it uses less digits than its factorization.

7638564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636554 (or 636552 counting only the distinct ones).

The product of its digits is 120960, while the sum is 39.

The square root of 7638564 is about 2763.7952167264. The cubic root of 7638564 is about 196.9414996317.

The spelling of 7638564 in words is "seven million, six hundred thirty-eight thousand, five hundred sixty-four".