72997544 has 32 divisors (see below), whose sum is σ = 145588800. Its totient is φ = 34214400.

The previous prime is 72997543. The next prime is 72997549. The reversal of 72997544 is 44579927.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (72997543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12269 + ... + 17219.

It is an arithmetic number, because the mean of its divisors is an integer number (4549650).

Almost surely, 2^72997544 is an apocalyptic number.

It is an amenable number.

72997544 is a deficient number, since it is larger than the sum of its proper divisors (72591256).

72997544 is a wasteful number, since it uses less digits than its factorization.

72997544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5073 (or 5069 counting only the distinct ones).

The product of its digits is 635040, while the sum is 47.

The square root of 72997544 is about 8543.8600175799. The cubic root of 72997544 is about 417.9292326189.

The spelling of 72997544 in words is "seventy-two million, nine hundred ninety-seven thousand, five hundred forty-four".