72931738 has 8 divisors (see below), whose sum is σ = 119342880. Its totient is φ = 33150780.

The previous prime is 72931721. The next prime is 72931759. The reversal of 72931738 is 83713927.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 72931738.

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 3 ways as a sum of consecutive naturals, for example, 1657518 + ... + 1657561.

It is an arithmetic number, because the mean of its divisors is an integer number (14917860).

Almost surely, 2^72931738 is an apocalyptic number.

72931738 is a deficient number, since it is larger than the sum of its proper divisors (46411142).

72931738 is a wasteful number, since it uses less digits than its factorization.

72931738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3315092.

The product of its digits is 63504, while the sum is 40.

The square root of 72931738 is about 8540.0080796215. The cubic root of 72931738 is about 417.8036095820.

The spelling of 72931738 in words is "seventy-two million, nine hundred thirty-one thousand, seven hundred thirty-eight".