72738730 has 16 divisors (see below), whose sum is σ = 131287464. Its totient is φ = 29016000.

The previous prime is 72738691. The next prime is 72738749. The reversal of 72738730 is 3783727.

It can be written as a sum of positive squares in 4 ways, for example, as 60481729 + 12257001 = 7777^2 + 3501^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 72738730.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6021 + ... + 13480.

Almost surely, 2^72738730 is an apocalyptic number.

72738730 is a deficient number, since it is larger than the sum of its proper divisors (58548734).

72738730 is a wasteful number, since it uses less digits than its factorization.

72738730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19881.

The product of its (nonzero) digits is 49392, while the sum is 37.

The square root of 72738730 is about 8528.7003699274. The cubic root of 72738730 is about 417.4347227236.

The spelling of 72738730 in words is "seventy-two million, seven hundred thirty-eight thousand, seven hundred thirty".