7865808664 has 16 divisors (see below), whose sum is σ = 16855304400. Its totient is φ = 3371060832.

The previous prime is 7865808637. The next prime is 7865808679. The reversal of 7865808664 is 4668085687.

It is a junction number, because it is equal to n+sod(n) for n = 7865808599 and 7865808608.

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, 70230379 + ... + 70230490.

It is an arithmetic number, because the mean of its divisors is an integer number (1053456525).

Almost surely, 2^7865808664 is an apocalyptic number.

It is an amenable number.

7865808664 is an abundant number, since it is smaller than the sum of its proper divisors (8989495736).

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

7865808664 is a wasteful number, since it uses less digits than its factorization.

7865808664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140460882 (or 140460878 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 58.

The square root of 7865808664 is about 88689.3943152167. The cubic root of 7865808664 is about 1988.7542740073.

The spelling of 7865808664 in words is "seven billion, eight hundred sixty-five million, eight hundred eight thousand, six hundred sixty-four".