7856664 has 32 divisors (see below), whose sum is σ = 19822320. Its totient is φ = 2594816.

The previous prime is 7856663. The next prime is 7856687. The reversal of 7856664 is 4666587.

It is a happy number.

7856664 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7856663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1264 + ... + 4160.

Almost surely, 2^7856664 is an apocalyptic number.

It is an amenable number.

7856664 is an abundant number, since it is smaller than the sum of its proper divisors (11965656).

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

7856664 is a wasteful number, since it uses less digits than its factorization.

7856664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3019 (or 3015 counting only the distinct ones).

The product of its digits is 241920, while the sum is 42.

The square root of 7856664 is about 2802.9741347362. The cubic root of 7856664 is about 198.7983277122.

The spelling of 7856664 in words is "seven million, eight hundred fifty-six thousand, six hundred sixty-four".