79877866 has 12 divisors (see below), whose sum is σ = 127280358. Its totient is φ = 37589312.

The previous prime is 79877821. The next prime is 79877887. The reversal of 79877866 is 66877897.

It can be written as a sum of positive squares in 3 ways, for example, as 74218225 + 5659641 = 8615^2 + 2379^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 79877866.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68521 + ... + 69676.

Almost surely, 2^79877866 is an apocalyptic number.

79877866 is a deficient number, since it is larger than the sum of its proper divisors (47402492).

79877866 is a wasteful number, since it uses less digits than its factorization.

79877866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138233 (or 138216 counting only the distinct ones).

The product of its digits is 7112448, while the sum is 58.

The square root of 79877866 is about 8937.4418040063. The cubic root of 79877866 is about 430.6675515525.

The spelling of 79877866 in words is "seventy-nine million, eight hundred seventy-seven thousand, eight hundred sixty-six".