72193988 has 12 divisors (see below), whose sum is σ = 128411052. Its totient is φ = 35505120.

The previous prime is 72193973. The next prime is 72194027. The reversal of 72193988 is 88939127.

It can be written as a sum of positive squares in 2 ways, for example, as 10445824 + 61748164 = 3232^2 + 7858^2 .

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

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, 147695 + ... + 148182.

It is an arithmetic number, because the mean of its divisors is an integer number (10700921).

Almost surely, 2^72193988 is an apocalyptic number.

It is an amenable number.

72193988 is a deficient number, since it is larger than the sum of its proper divisors (56217064).

72193988 is a wasteful number, since it uses less digits than its factorization.

72193988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295942 (or 295940 counting only the distinct ones).

The product of its digits is 217728, while the sum is 47.

The square root of 72193988 is about 8496.7045376428. The cubic root of 72193988 is about 416.3900511397.

The spelling of 72193988 in words is "seventy-two million, one hundred ninety-three thousand, nine hundred eighty-eight".