79920089 has 4 divisors (see below), whose sum is σ = 79952400. Its totient is φ = 79887780.

The previous prime is 79920083. The next prime is 79920091. The reversal of 79920089 is 98002997.

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.

It is a cyclic number.

It is not a de Polignac number, because 79920089 - 2⁴ = 79920073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79920083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12107 + ... + 17504.

It is an arithmetic number, because the mean of its divisors is an integer number (19988100).

Almost surely, 2^79920089 is an apocalyptic number.

It is an amenable number.

79920089 is a deficient number, since it is larger than the sum of its proper divisors (32311).

79920089 is a wasteful number, since it uses less digits than its factorization.

79920089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32310.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 79920089 is about 8939.8036331902. The cubic root of 79920089 is about 430.7434210179.

The spelling of 79920089 in words is "seventy-nine million, nine hundred twenty thousand, eighty-nine".