72640324 has 24 divisors (see below), whose sum is σ = 131382720. Its totient is φ = 35114976.

The previous prime is 72640319. The next prime is 72640339. The reversal of 72640324 is 42304627.

It is a junction number, because it is equal to n+sod(n) for n = 72640292 and 72640301.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23247 + ... + 26185.

It is an arithmetic number, because the mean of its divisors is an integer number (5474280).

Almost surely, 2^72640324 is an apocalyptic number.

72640324 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

It is an amenable number.

72640324 is a deficient number, since it is larger than the sum of its proper divisors (58742396).

72640324 is a wasteful number, since it uses less digits than its factorization.

72640324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3147 (or 3145 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 72640324 is about 8522.9293086356. The cubic root of 72640324 is about 417.2463928857.

The spelling of 72640324 in words is "seventy-two million, six hundred forty thousand, three hundred twenty-four".