7688864 has 24 divisors (see below), whose sum is σ = 15215508. Its totient is φ = 3824640.

The previous prime is 7688861. The next prime is 7688881. The reversal of 7688864 is 4688867.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6864400 + 824464 = 2620^2 + 908^2 .

It is a super-2 number, since 2×7688864² = 118237259220992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7688861) 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, 7214 + ... + 8210.

Almost surely, 2^7688864 is an apocalyptic number.

It is an amenable number.

7688864 is a deficient number, since it is larger than the sum of its proper divisors (7526644).

7688864 is a wasteful number, since it uses less digits than its factorization.

7688864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248 (or 1240 counting only the distinct ones).

The product of its digits is 516096, while the sum is 47.

The square root of 7688864 is about 2772.8800911687. The cubic root of 7688864 is about 197.3728412902.

The spelling of 7688864 in words is "seven million, six hundred eighty-eight thousand, eight hundred sixty-four".