72997542 has 24 divisors (see below), whose sum is σ = 159700944. Its totient is φ = 24095664.

The previous prime is 72997517. The next prime is 72997543. The reversal of 72997542 is 24579927.

It is a super-2 number, since 2×72997542² = 10657282276083528, which contains 22 as substring.

It is a congruent number.

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17833 + ... + 21540.

It is an arithmetic number, because the mean of its divisors is an integer number (6654206).

Almost surely, 2^72997542 is an apocalyptic number.

72997542 is an abundant number, since it is smaller than the sum of its proper divisors (86703402).

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

72997542 is a wasteful number, since it uses less digits than its factorization.

72997542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39484 (or 39481 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 72997542 is about 8543.8599005368. The cubic root of 72997542 is about 417.9292288020.

It can be divided in two parts, 7299 and 7542, that added together give a palindrome (14841).

The spelling of 72997542 in words is "seventy-two million, nine hundred ninety-seven thousand, five hundred forty-two".