73438704521 has 24 divisors (see below), whose sum is σ = 91677644352. Its totient is φ = 57286605600.

The previous prime is 73438704517. The next prime is 73438704541. The reversal of 73438704521 is 12540783437.

It is not a de Polignac number, because 73438704521 - 2² = 73438704517 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (73438704511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 378686 + ... + 538776.

It is an arithmetic number, because the mean of its divisors is an integer number (3819901848).

Almost surely, 2^73438704521 is an apocalyptic number.

73438704521 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

73438704521 is a deficient number, since it is larger than the sum of its proper divisors (18238939831).

73438704521 is a wasteful number, since it uses less digits than its factorization.

73438704521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160253 (or 160182 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 44.

The spelling of 73438704521 in words is "seventy-three billion, four hundred thirty-eight million, seven hundred four thousand, five hundred twenty-one".