79961690 has 16 divisors (see below), whose sum is σ = 151506720. Its totient is φ = 30301200.

The previous prime is 79961689. The next prime is 79961701. The reversal of 79961690 is 9616997.

It is a happy number.

It is a super-2 number, since 2×79961690² = 12787743735312200, which contains 22 as substring.

It is a Curzon number.

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, 210236 + ... + 210615.

It is an arithmetic number, because the mean of its divisors is an integer number (9469170).

Almost surely, 2^79961690 is an apocalyptic number.

79961690 is a deficient number, since it is larger than the sum of its proper divisors (71545030).

79961690 is a wasteful number, since it uses less digits than its factorization.

79961690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420877.

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 79961690 is about 8942.1300594433. The cubic root of 79961690 is about 430.8181466969.

The spelling of 79961690 in words is "seventy-nine million, nine hundred sixty-one thousand, six hundred ninety".