79220777 has 4 divisors (see below), whose sum is σ = 79383936. Its totient is φ = 79057620.

The previous prime is 79220759. The next prime is 79220789. The reversal of 79220777 is 77702297.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77702297 = 947 ⋅82051.

It is a cyclic number.

It is not a de Polignac number, because 79220777 - 2²⁰ = 78172201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79220707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80849 + ... + 81822.

It is an arithmetic number, because the mean of its divisors is an integer number (19845984).

Almost surely, 2^79220777 is an apocalyptic number.

It is an amenable number.

79220777 is a deficient number, since it is larger than the sum of its proper divisors (163159).

79220777 is a wasteful number, since it uses less digits than its factorization.

79220777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163158.

The product of its (nonzero) digits is 86436, while the sum is 41.

The square root of 79220777 is about 8900.6054288458. The cubic root of 79220777 is about 429.4833835343.

It can be divided in two parts, 79220 and 777, that added together give a palindrome (79997).

The spelling of 79220777 in words is "seventy-nine million, two hundred twenty thousand, seven hundred seventy-seven".