72131188 has 6 divisors (see below), whose sum is σ = 126229586. Its totient is φ = 36065592.

The previous prime is 72131159. The next prime is 72131231. The reversal of 72131188 is 88113127.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 68359824 + 3771364 = 8268^2 + 1942^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 9016395 + ... + 9016402.

Almost surely, 2^72131188 is an apocalyptic number.

It is an amenable number.

72131188 is a deficient number, since it is larger than the sum of its proper divisors (54098398).

72131188 is a wasteful number, since it uses less digits than its factorization.

72131188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18032801 (or 18032799 counting only the distinct ones).

The product of its digits is 2688, while the sum is 31.

The square root of 72131188 is about 8493.0081832058. The cubic root of 72131188 is about 416.2692798592.

The spelling of 72131188 in words is "seventy-two million, one hundred thirty-one thousand, one hundred eighty-eight".