72549321 has 16 divisors (see below), whose sum is σ = 104455680. Its totient is φ = 44524800.

The previous prime is 72549293. The next prime is 72549343. The reversal of 72549321 is 12394527.

It is not a de Polignac number, because 72549321 - 2⁵ = 72549289 is a prime.

It is a super-2 number, since 2×72549321² = 10526807955122082, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72549361) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 13320 + ... + 17958.

It is an arithmetic number, because the mean of its divisors is an integer number (6528480).

Almost surely, 2^72549321 is an apocalyptic number.

It is an amenable number.

72549321 is a deficient number, since it is larger than the sum of its proper divisors (31906359).

72549321 is a wasteful number, since it uses less digits than its factorization.

72549321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5056.

The product of its digits is 15120, while the sum is 33.

The square root of 72549321 is about 8517.5889194067. The cubic root of 72549321 is about 417.0720795069.

The spelling of 72549321 in words is "seventy-two million, five hundred forty-nine thousand, three hundred twenty-one".