72451992 has 32 divisors (see below), whose sum is σ = 181350000. Its totient is φ = 24121344.

The previous prime is 72451979. The next prime is 72451993. The reversal of 72451992 is 29915427.

It is a super-2 number, since 2×72451992² = 10498582289536128, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 72451992.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72451993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28768 + ... + 31184.

Almost surely, 2^72451992 is an apocalyptic number.

It is an amenable number.

72451992 is an abundant number, since it is smaller than the sum of its proper divisors (108898008).

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

72451992 is a wasteful number, since it uses less digits than its factorization.

72451992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3675 (or 3671 counting only the distinct ones).

The product of its digits is 45360, while the sum is 39.

The square root of 72451992 is about 8511.8735892869. The cubic root of 72451992 is about 416.8854874795.

The spelling of 72451992 in words is "seventy-two million, four hundred fifty-one thousand, nine hundred ninety-two".