73121564 has 12 divisors (see below), whose sum is σ = 128703624. Its totient is φ = 36349104.

The previous prime is 73121563. The next prime is 73121579. The reversal of 73121564 is 46512137.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73121561) 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, 52142 + ... + 53525.

It is an arithmetic number, because the mean of its divisors is an integer number (10725302).

Almost surely, 2^73121564 is an apocalyptic number.

It is an amenable number.

73121564 is a deficient number, since it is larger than the sum of its proper divisors (55582060).

73121564 is a wasteful number, since it uses less digits than its factorization.

73121564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105844 (or 105842 counting only the distinct ones).

The product of its digits is 5040, while the sum is 29.

The square root of 73121564 is about 8551.1147811265. The cubic root of 73121564 is about 418.1657805673.

The spelling of 73121564 in words is "seventy-three million, one hundred twenty-one thousand, five hundred sixty-four".