72521432 has 8 divisors (see below), whose sum is σ = 135977700. Its totient is φ = 36260712.

The previous prime is 72521419. The next prime is 72521453. The reversal of 72521432 is 23412527.

It is a tau number, because it is divible by the number of its divisors (8).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4532582 + ... + 4532597.

Almost surely, 2^72521432 is an apocalyptic number.

It is an amenable number.

72521432 is a deficient number, since it is larger than the sum of its proper divisors (63456268).

72521432 is a wasteful number, since it uses less digits than its factorization.

72521432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9065185 (or 9065181 counting only the distinct ones).

The product of its digits is 3360, while the sum is 26.

The square root of 72521432 is about 8515.9516203417. The cubic root of 72521432 is about 417.0186298267.

Adding to 72521432 its reverse (23412527), we get a palindrome (95933959).

The spelling of 72521432 in words is "seventy-two million, five hundred twenty-one thousand, four hundred thirty-two".