72137908 has 18 divisors (see below), whose sum is σ = 133237986. Its totient is φ = 34169904.

The previous prime is 72137893. The next prime is 72137909. The reversal of 72137908 is 80973127.

It can be written as a sum of positive squares in only one way, i.e., 54346384 + 17791524 = 7372^2 + 4218^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72137909) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 23535 + ... + 26422.

Almost surely, 2^72137908 is an apocalyptic number.

It is an amenable number.

72137908 is a deficient number, since it is larger than the sum of its proper divisors (61100078).

72137908 is a wasteful number, since it uses less digits than its factorization.

72137908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49999 (or 49978 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 72137908 is about 8493.4037935330. The cubic root of 72137908 is about 416.2822065038.

The spelling of 72137908 in words is "seventy-two million, one hundred thirty-seven thousand, nine hundred eight".