79821580 has 24 divisors (see below), whose sum is σ = 172157328. Its totient is φ = 31065408.

The previous prime is 79821563. The next prime is 79821587. The reversal of 79821580 is 8512897.

It is not an unprimeable number, because it can be changed into a prime (79821587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53194 + ... + 54673.

It is an arithmetic number, because the mean of its divisors is an integer number (7173222).

Almost surely, 2^79821580 is an apocalyptic number.

It is an amenable number.

79821580 is an abundant number, since it is smaller than the sum of its proper divisors (92335748).

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

79821580 is a wasteful number, since it uses less digits than its factorization.

79821580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107913 (or 107911 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 79821580 is about 8934.2923614576. The cubic root of 79821580 is about 430.5663710421.

The spelling of 79821580 in words is "seventy-nine million, eight hundred twenty-one thousand, five hundred eighty".