79815906 has 24 divisors (see below), whose sum is σ = 173260620. Its totient is φ = 26555136.

The previous prime is 79815893. The next prime is 79815913. The reversal of 79815906 is 60951897.

It can be written as a sum of positive squares in 2 ways, for example, as 78481881 + 1334025 = 8859^2 + 1155^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6346 + ... + 14138.

Almost surely, 2^79815906 is an apocalyptic number.

79815906 is an abundant number, since it is smaller than the sum of its proper divisors (93444714).

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

79815906 is a wasteful number, since it uses less digits than its factorization.

79815906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8370 (or 8367 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 79815906 is about 8933.9748152768. The cubic root of 79815906 is about 430.5561687406.

The spelling of 79815906 in words is "seventy-nine million, eight hundred fifteen thousand, nine hundred six".