72456621 has 4 divisors (see below), whose sum is σ = 96608832. Its totient is φ = 48304412.

The previous prime is 72456613. The next prime is 72456623. The reversal of 72456621 is 12665427.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72456621 - 2³ = 72456613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72456623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12076101 + ... + 12076106.

It is an arithmetic number, because the mean of its divisors is an integer number (24152208).

Almost surely, 2^72456621 is an apocalyptic number.

It is an amenable number.

72456621 is a deficient number, since it is larger than the sum of its proper divisors (24152211).

72456621 is a wasteful number, since it uses less digits than its factorization.

72456621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24152210.

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

The square root of 72456621 is about 8512.1454992264. The cubic root of 72456621 is about 416.8943656427.

It can be divided in two parts, 724566 and 21, that multiplied together give a triangular number (15215886 = T₅₅₁₆).

The spelling of 72456621 in words is "seventy-two million, four hundred fifty-six thousand, six hundred twenty-one".