79866660 has 48 divisors (see below), whose sum is σ = 224784000. Its totient is φ = 21187584.

The previous prime is 79866623. The next prime is 79866673. The reversal of 79866660 is 6666897.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8596 + ... + 15284.

It is an arithmetic number, because the mean of its divisors is an integer number (4683000).

Almost surely, 2^79866660 is an apocalyptic number.

It is an amenable number.

79866660 is an abundant number, since it is smaller than the sum of its proper divisors (144917340).

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

79866660 is a wasteful number, since it uses less digits than its factorization.

79866660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6900 (or 6898 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 48.

The square root of 79866660 is about 8936.8148688445. The cubic root of 79866660 is about 430.6474112787.

The spelling of 79866660 in words is "seventy-nine million, eight hundred sixty-six thousand, six hundred sixty".