7880664 has 32 divisors (see below), whose sum is σ = 21493440. Its totient is φ = 2388000.

The previous prime is 7880659. The next prime is 7880671. The reversal of 7880664 is 4660887.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14662 + ... + 15189.

It is an arithmetic number, because the mean of its divisors is an integer number (671670).

Almost surely, 2^7880664 is an apocalyptic number.

It is an amenable number.

7880664 is an abundant number, since it is smaller than the sum of its proper divisors (13612776).

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

7880664 is a wasteful number, since it uses less digits than its factorization.

7880664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29871 (or 29867 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 7880664 is about 2807.2520371352. The cubic root of 7880664 is about 199.0005471227. Note that the first 3 decimals are identical.

The spelling of 7880664 in words is "seven million, eight hundred eighty thousand, six hundred sixty-four".