79821668 has 12 divisors (see below), whose sum is σ = 139758192. Its totient is φ = 39890760.

The previous prime is 79821653. The next prime is 79821673. The reversal of 79821668 is 86612897.

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, 7271 + ... + 14577.

It is an arithmetic number, because the mean of its divisors is an integer number (11646516).

Almost surely, 2^79821668 is an apocalyptic number.

It is an amenable number.

79821668 is a deficient number, since it is larger than the sum of its proper divisors (59936524).

79821668 is a wasteful number, since it uses less digits than its factorization.

79821668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10042 (or 10040 counting only the distinct ones).

The product of its digits is 290304, while the sum is 47.

The square root of 79821668 is about 8934.2972863007. The cubic root of 79821668 is about 430.5665292693.

The spelling of 79821668 in words is "seventy-nine million, eight hundred twenty-one thousand, six hundred sixty-eight".