79773809 has 16 divisors (see below), whose sum is σ = 88283520. Its totient is φ = 71742720.

The previous prime is 79773803. The next prime is 79773817. The reversal of 79773809 is 90837797.

It is not a de Polignac number, because 79773809 - 2⁸ = 79773553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79773803) 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, 49994 + ... + 51564.

It is an arithmetic number, because the mean of its divisors is an integer number (5517720).

Almost surely, 2^79773809 is an apocalyptic number.

It is an amenable number.

79773809 is a deficient number, since it is larger than the sum of its proper divisors (8509711).

79773809 is a wasteful number, since it uses less digits than its factorization.

79773809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1720.

The product of its (nonzero) digits is 666792, while the sum is 50.

The square root of 79773809 is about 8931.6184983462. The cubic root of 79773809 is about 430.4804598941.

The spelling of 79773809 in words is "seventy-nine million, seven hundred seventy-three thousand, eight hundred nine".