7640656 has 20 divisors (see below), whose sum is σ = 14945472. Its totient is φ = 3783776.

The previous prime is 7640621. The next prime is 7640681. The reversal of 7640656 is 6560467.

It is a super-2 number, since 2×7640656² = 116759248220672, which contains 22 as substring.

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, 520 + ... + 3943.

Almost surely, 2^7640656 is an apocalyptic number.

It is an amenable number.

7640656 is a deficient number, since it is larger than the sum of its proper divisors (7304816).

7640656 is a wasteful number, since it uses less digits than its factorization.

7640656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4578 (or 4572 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 7640656 is about 2764.1736559051. The cubic root of 7640656 is about 196.9594770077.

The spelling of 7640656 in words is "seven million, six hundred forty thousand, six hundred fifty-six".