72721023 has 4 divisors (see below), whose sum is σ = 96961368. Its totient is φ = 48480680.

The previous prime is 72721013. The next prime is 72721073. The reversal of 72721023 is 32012727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32012727 = 3 ⋅10670909.

It is a cyclic number.

It is not a de Polignac number, because 72721023 - 2⁴ = 72721007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72720984 and 72721002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72721013) 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, 12120168 + ... + 12120173.

It is an arithmetic number, because the mean of its divisors is an integer number (24240342).

Almost surely, 2^72721023 is an apocalyptic number.

72721023 is a deficient number, since it is larger than the sum of its proper divisors (24240345).

72721023 is a wasteful number, since it uses less digits than its factorization.

72721023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24240344.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 72721023 is about 8527.6622236109. The cubic root of 72721023 is about 417.4008475263.

The spelling of 72721023 in words is "seventy-two million, seven hundred twenty-one thousand, twenty-three".