79681892 has 6 divisors (see below), whose sum is σ = 139443318. Its totient is φ = 39840944.

The previous prime is 79681891. The next prime is 79681963. The reversal of 79681892 is 29818697.

It can be written as a sum of positive squares in only one way, i.e., 75933796 + 3748096 = 8714^2 + 1936^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 79681892.

It is not an unprimeable number, because it can be changed into a prime (79681891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9960233 + ... + 9960240.

It is an arithmetic number, because the mean of its divisors is an integer number (23240553).

Almost surely, 2^79681892 is an apocalyptic number.

It is an amenable number.

79681892 is a deficient number, since it is larger than the sum of its proper divisors (59761426).

79681892 is a wasteful number, since it uses less digits than its factorization.

79681892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19920477 (or 19920475 counting only the distinct ones).

The product of its digits is 435456, while the sum is 50.

The square root of 79681892 is about 8926.4714193235. The cubic root of 79681892 is about 430.3150602479.

The spelling of 79681892 in words is "seventy-nine million, six hundred eighty-one thousand, eight hundred ninety-two".