72525321 has 32 divisors (see below), whose sum is σ = 118304640. Its totient is φ = 43545600.

The previous prime is 72525307. The next prime is 72525331. The reversal of 72525321 is 12352527.

It is not a de Polignac number, because 72525321 - 2¹⁰ = 72524297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (72525331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32481 + ... + 34641.

It is an arithmetic number, because the mean of its divisors is an integer number (3697020).

Almost surely, 2^72525321 is an apocalyptic number.

It is an amenable number.

72525321 is a deficient number, since it is larger than the sum of its proper divisors (45779319).

72525321 is a wasteful number, since it uses less digits than its factorization.

72525321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2294 (or 2288 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 72525321 is about 8516.1799534768. The cubic root of 72525321 is about 417.0260839747.

Adding to 72525321 its reverse (12352527), we get a palindrome (84877848).

The spelling of 72525321 in words is "seventy-two million, five hundred twenty-five thousand, three hundred twenty-one".