72787664 has 10 divisors (see below), whose sum is σ = 141026130. Its totient is φ = 36393824.

The previous prime is 72787607. The next prime is 72787667. The reversal of 72787664 is 46678727.

It can be written as a sum of positive squares in only one way, i.e., 56851600 + 15936064 = 7540^2 + 3992^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72787667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2274599 + ... + 2274630.

It is an arithmetic number, because the mean of its divisors is an integer number (14102613).

Almost surely, 2^72787664 is an apocalyptic number.

It is an amenable number.

72787664 is a deficient number, since it is larger than the sum of its proper divisors (68238466).

72787664 is a wasteful number, since it uses less digits than its factorization.

72787664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4549237 (or 4549231 counting only the distinct ones).

The product of its digits is 790272, while the sum is 47.

The square root of 72787664 is about 8531.5686717039. The cubic root of 72787664 is about 417.5283096010.

The spelling of 72787664 in words is "seventy-two million, seven hundred eighty-seven thousand, six hundred sixty-four".