679971564 has 24 divisors (see below), whose sum is σ = 1762889520. Its totient is φ = 226657152.

The previous prime is 679971557. The next prime is 679971581. The reversal of 679971564 is 465179976.

679971564 is a `hidden beast` number, since 6 + 7 + 9 + 9 + 71 + 564 = 666.

It is a super-2 number, since 2×679971564² = 924722655697212192, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 679971564.

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, 3147909 + ... + 3148124.

It is an arithmetic number, because the mean of its divisors is an integer number (73453730).

Almost surely, 2^679971564 is an apocalyptic number.

It is an amenable number.

679971564 is an abundant number, since it is smaller than the sum of its proper divisors (1082917956).

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

679971564 is a wasteful number, since it uses less digits than its factorization.

679971564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6296046 (or 6296038 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 54.

The square root of 679971564 is about 26076.2643796998. The cubic root of 679971564 is about 879.3536765893.

The spelling of 679971564 in words is "six hundred seventy-nine million, nine hundred seventy-one thousand, five hundred sixty-four".