7639664 has 20 divisors (see below), whose sum is σ = 15673104. Its totient is φ = 3595008.

The previous prime is 7639663. The next prime is 7639699. The reversal of 7639664 is 4669367.

It is a happy number.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7639663) 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, 13772 + ... + 14315.

Almost surely, 2^7639664 is an apocalyptic number.

It is an amenable number.

7639664 is an abundant number, since it is smaller than the sum of its proper divisors (8033440).

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

7639664 is a wasteful number, since it uses less digits than its factorization.

7639664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28112 (or 28106 counting only the distinct ones).

The product of its digits is 163296, while the sum is 41.

The square root of 7639664 is about 2763.9942112819. The cubic root of 7639664 is about 196.9509527720.

The spelling of 7639664 in words is "seven million, six hundred thirty-nine thousand, six hundred sixty-four".