79991580 has 24 divisors (see below), whose sum is σ = 223976592. Its totient is φ = 21331072.

The previous prime is 79991531. The next prime is 79991591. The reversal of 79991580 is 8519997.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 666537 + ... + 666656.

It is an arithmetic number, because the mean of its divisors is an integer number (9332358).

Almost surely, 2^79991580 is an apocalyptic number.

It is an amenable number.

79991580 is an abundant number, since it is smaller than the sum of its proper divisors (143985012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79991580 is a wasteful number, since it uses less digits than its factorization.

79991580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333205 (or 1333203 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 48.

The square root of 79991580 is about 8943.8012053042. The cubic root of 79991580 is about 430.8718205259.

The spelling of 79991580 in words is "seventy-nine million, nine hundred ninety-one thousand, five hundred eighty".