72317144 has 8 divisors (see below), whose sum is σ = 135594660. Its totient is φ = 36158568.

The previous prime is 72317143. The next prime is 72317149. The reversal of 72317144 is 44171327.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72317143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4519814 + ... + 4519829.

Almost surely, 2^72317144 is an apocalyptic number.

It is an amenable number.

72317144 is a deficient number, since it is larger than the sum of its proper divisors (63277516).

72317144 is a wasteful number, since it uses less digits than its factorization.

72317144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9039649 (or 9039645 counting only the distinct ones).

The product of its digits is 4704, while the sum is 29.

The square root of 72317144 is about 8503.9487298549. The cubic root of 72317144 is about 416.6266904225.

The spelling of 72317144 in words is "seventy-two million, three hundred seventeen thousand, one hundred forty-four".