72873021 has 16 divisors (see below), whose sum is σ = 104872320. Its totient is φ = 44744640.

The previous prime is 72873011. The next prime is 72873041. The reversal of 72873021 is 12037827.

It is not a de Polignac number, because 72873021 - 2¹⁹ = 72348733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72873021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72873001) 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, 18016 + ... + 21686.

It is an arithmetic number, because the mean of its divisors is an integer number (6554520).

Almost surely, 2^72873021 is an apocalyptic number.

It is an amenable number.

72873021 is a deficient number, since it is larger than the sum of its proper divisors (31999299).

72873021 is a wasteful number, since it uses less digits than its factorization.

72873021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4196.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 72873021 is about 8536.5696271980. The cubic root of 72873021 is about 417.6914555699.

The spelling of 72873021 in words is "seventy-two million, eight hundred seventy-three thousand, twenty-one".