72147188 has 12 divisors (see below), whose sum is σ = 129670212. Its totient is φ = 35098560.

The previous prime is 72147181. The next prime is 72147193. The reversal of 72147188 is 88174127.

It can be written as a sum of positive squares in 2 ways, for example, as 65480464 + 6666724 = 8092^2 + 2582^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72147181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243593 + ... + 243888.

It is an arithmetic number, because the mean of its divisors is an integer number (10805851).

Almost surely, 2^72147188 is an apocalyptic number.

It is an amenable number.

72147188 is a deficient number, since it is larger than the sum of its proper divisors (57523024).

72147188 is a wasteful number, since it uses less digits than its factorization.

72147188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487522 (or 487520 counting only the distinct ones).

The product of its digits is 25088, while the sum is 38.

The square root of 72147188 is about 8493.9500822644. The cubic root of 72147188 is about 416.3000562647.

The spelling of 72147188 in words is "seventy-two million, one hundred forty-seven thousand, one hundred eighty-eight".