72321525 has 48 divisors (see below), whose sum is σ = 133672000. Its totient is φ = 38335680.

The previous prime is 72321517. The next prime is 72321527. The reversal of 72321525 is 52512327.

It is not a de Polignac number, because 72321525 - 2³ = 72321517 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72321527) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 207051 + ... + 207399.

Almost surely, 2^72321525 is an apocalyptic number.

72321525 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

72321525 is a deficient number, since it is larger than the sum of its proper divisors (61350475).

72321525 is a wasteful number, since it uses less digits than its factorization.

72321525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675 (or 664 counting only the distinct ones).

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

The square root of 72321525 is about 8504.2063121728. The cubic root of 72321525 is about 416.6351033869.

The spelling of 72321525 in words is "seventy-two million, three hundred twenty-one thousand, five hundred twenty-five".