72991772 has 24 divisors (see below), whose sum is σ = 148965600. Its totient is φ = 31281600.

The previous prime is 72991771. The next prime is 72991783. The reversal of 72991772 is 27719927.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72991771) 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, 25229 + ... + 27972.

It is an arithmetic number, because the mean of its divisors is an integer number (6206900).

Almost surely, 2^72991772 is an apocalyptic number.

It is an amenable number.

72991772 is an abundant number, since it is smaller than the sum of its proper divisors (75973828).

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

72991772 is a wasteful number, since it uses less digits than its factorization.

72991772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53226 (or 53210 counting only the distinct ones).

The product of its digits is 111132, while the sum is 44.

The square root of 72991772 is about 8543.5222244692. The cubic root of 72991772 is about 417.9182169464.

The spelling of 72991772 in words is "seventy-two million, nine hundred ninety-one thousand, seven hundred seventy-two".