79878905 has 16 divisors (see below), whose sum is σ = 100569600. Its totient is φ = 60822720.

The previous prime is 79878901. The next prime is 79878913. The reversal of 79878905 is 50987897.

It is not a de Polignac number, because 79878905 - 2² = 79878901 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 6416 + ... + 14174.

It is an arithmetic number, because the mean of its divisors is an integer number (6285600).

Almost surely, 2^79878905 is an apocalyptic number.

It is an amenable number.

79878905 is a deficient number, since it is larger than the sum of its proper divisors (20690695).

79878905 is a wasteful number, since it uses less digits than its factorization.

79878905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7864.

The product of its (nonzero) digits is 1270080, while the sum is 53.

The square root of 79878905 is about 8937.4999300699. The cubic root of 79878905 is about 430.6694188268.

The spelling of 79878905 in words is "seventy-nine million, eight hundred seventy-eight thousand, nine hundred five".