72504321 has 16 divisors (see below), whose sum is σ = 102336960. Its totient is φ = 45581760.

The previous prime is 72504301. The next prime is 72504343. The reversal of 72504321 is 12340527.

It is not a de Polignac number, because 72504321 - 2¹³ = 72496129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72504291 and 72504300.

It is not an unprimeable number, because it can be changed into a prime (72504301) 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, 5950 + ... + 13431.

It is an arithmetic number, because the mean of its divisors is an integer number (6396060).

Almost surely, 2^72504321 is an apocalyptic number.

It is an amenable number.

72504321 is a deficient number, since it is larger than the sum of its proper divisors (29832639).

72504321 is a wasteful number, since it uses less digits than its factorization.

72504321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19456.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 72504321 is about 8514.9469170395. The cubic root of 72504321 is about 416.9858295595.

Adding to 72504321 its reverse (12340527), we get a palindrome (84844848).

The spelling of 72504321 in words is "seventy-two million, five hundred four thousand, three hundred twenty-one".