79878906 has 64 divisors (see below), whose sum is σ = 184060800. Its totient is φ = 25660800.

The previous prime is 79878901. The next prime is 79878913. The reversal of 79878906 is 60987897.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (79878901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 241161 + ... + 241491.

It is an arithmetic number, because the mean of its divisors is an integer number (2875950).

Almost surely, 2^79878906 is an apocalyptic number.

It is a pronic number, being equal to 8937×8938.

It is a practical number, because each smaller number is the sum of distinct divisors of 79878906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92030400).

79878906 is an abundant number, since it is smaller than the sum of its proper divisors (104181894).

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

79878906 is a wasteful number, since it uses less digits than its factorization.

79878906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The square root of 79878906 is about 8937.4999860140. The cubic root of 79878906 is about 430.6694206239.

The spelling of 79878906 in words is "seventy-nine million, eight hundred seventy-eight thousand, nine hundred six".