73438521 has 32 divisors (see below), whose sum is σ = 112347648. Its totient is φ = 42270720.

The previous prime is 73438513. The next prime is 73438523. The reversal of 73438521 is 12583437.

It is not a de Polignac number, because 73438521 - 2³ = 73438513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (73438523) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 170176 + ... + 170606.

It is an arithmetic number, because the mean of its divisors is an integer number (3510864).

Almost surely, 2^73438521 is an apocalyptic number.

It is an amenable number.

73438521 is a deficient number, since it is larger than the sum of its proper divisors (38909127).

73438521 is a wasteful number, since it uses less digits than its factorization.

73438521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721.

The product of its digits is 20160, while the sum is 33.

The square root of 73438521 is about 8569.6278215568. The cubic root of 73438521 is about 418.7691115953.

The spelling of 73438521 in words is "seventy-three million, four hundred thirty-eight thousand, five hundred twenty-one".