72731790 has 32 divisors (see below), whose sum is σ = 193952160. Its totient is φ = 19395072.

The previous prime is 72731777. The next prime is 72731801. The reversal of 72731790 is 9713727.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 134419 + ... + 134958.

It is an arithmetic number, because the mean of its divisors is an integer number (6061005).

Almost surely, 2^72731790 is an apocalyptic number.

72731790 is an abundant number, since it is smaller than the sum of its proper divisors (121220370).

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

72731790 is a wasteful number, since it uses less digits than its factorization.

72731790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269393 (or 269387 counting only the distinct ones).

The product of its (nonzero) digits is 18522, while the sum is 36.

The square root of 72731790 is about 8528.2934987018. The cubic root of 72731790 is about 417.4214464900.

The spelling of 72731790 in words is "seventy-two million, seven hundred thirty-one thousand, seven hundred ninety".