79290881 has 4 divisors (see below), whose sum is σ = 79381764. Its totient is φ = 79200000.

The previous prime is 79290877. The next prime is 79290929. The reversal of 79290881 is 18809297.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56010256 + 23280625 = 7484^2 + 4825^2 .

It is a cyclic number.

It is not a de Polignac number, because 79290881 - 2² = 79290877 is a prime.

It is a super-2 number, since 2×79290881² = 12574087619512322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79293881) 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, 44120 + ... + 45881.

It is an arithmetic number, because the mean of its divisors is an integer number (19845441).

Almost surely, 2^79290881 is an apocalyptic number.

It is an amenable number.

79290881 is a deficient number, since it is larger than the sum of its proper divisors (90883).

79290881 is an equidigital number, since it uses as much as digits as its factorization.

79290881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90882.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 79290881 is about 8904.5427170630. The cubic root of 79290881 is about 429.6100322386.

The spelling of 79290881 in words is "seventy-nine million, two hundred ninety thousand, eight hundred eighty-one".