72900508521 has 16 divisors (see below), whose sum is σ = 101495422080. Its totient is φ = 46455826560.

The previous prime is 72900508507. The next prime is 72900508537. The reversal of 72900508521 is 12580500927.

It is not a de Polignac number, because 72900508521 - 2⁵ = 72900508489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72900508521.

It is not an unprimeable number, because it can be changed into a prime (72900508921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 254506 + ... + 458883.

It is an arithmetic number, because the mean of its divisors is an integer number (6343463880).

Almost surely, 2^72900508521 is an apocalyptic number.

It is an amenable number.

72900508521 is a deficient number, since it is larger than the sum of its proper divisors (28594913559).

72900508521 is a wasteful number, since it uses less digits than its factorization.

72900508521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714896.

The product of its (nonzero) digits is 50400, while the sum is 39.

The spelling of 72900508521 in words is "seventy-two billion, nine hundred million, five hundred eight thousand, five hundred twenty-one".