79821573 has 24 divisors (see below), whose sum is σ = 115843392. Its totient is φ = 48866688.

The previous prime is 79821563. The next prime is 79821587. The reversal of 79821573 is 37512897.

It is not a de Polignac number, because 79821573 - 2⁶ = 79821509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79821503) 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 23 ways as a sum of consecutive naturals, for example, 158440 + ... + 158942.

It is an arithmetic number, because the mean of its divisors is an integer number (4826808).

Almost surely, 2^79821573 is an apocalyptic number.

It is an amenable number.

79821573 is a deficient number, since it is larger than the sum of its proper divisors (36021819).

79821573 is a wasteful number, since it uses less digits than its factorization.

79821573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845 (or 832 counting only the distinct ones).

The product of its digits is 105840, while the sum is 42.

The square root of 79821573 is about 8934.2919697086. The cubic root of 79821573 is about 430.5663584559.

The spelling of 79821573 in words is "seventy-nine million, eight hundred twenty-one thousand, five hundred seventy-three".