72137816 has 8 divisors (see below), whose sum is σ = 135258420. Its totient is φ = 36068904.

The previous prime is 72137743. The next prime is 72137881. The reversal of 72137816 is 61873127.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4508606 + ... + 4508621.

Almost surely, 2^72137816 is an apocalyptic number.

It is an amenable number.

72137816 is a deficient number, since it is larger than the sum of its proper divisors (63120604).

72137816 is a wasteful number, since it uses less digits than its factorization.

72137816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9017233 (or 9017229 counting only the distinct ones).

The product of its digits is 14112, while the sum is 35.

The square root of 72137816 is about 8493.3983775636. The cubic root of 72137816 is about 416.2820295373.

The spelling of 72137816 in words is "seventy-two million, one hundred thirty-seven thousand, eight hundred sixteen".