72544528 has 20 divisors (see below), whose sum is σ = 160634560. Its totient is φ = 31090464.

The previous prime is 72544501. The next prime is 72544541. The reversal of 72544528 is 82544527.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323748 + ... + 323971.

It is an arithmetic number, because the mean of its divisors is an integer number (8031728).

Almost surely, 2^72544528 is an apocalyptic number.

It is an amenable number.

72544528 is an abundant number, since it is smaller than the sum of its proper divisors (88090032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72544528 is a wasteful number, since it uses less digits than its factorization.

72544528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647734 (or 647728 counting only the distinct ones).

The product of its digits is 89600, while the sum is 37.

The square root of 72544528 is about 8517.3075557948. The cubic root of 72544528 is about 417.0628946265.

Subtracting 72544528 from its reverse (82544527), we obtain a palindrome (9999999).

The spelling of 72544528 in words is "seventy-two million, five hundred forty-four thousand, five hundred twenty-eight".