72889664 has 14 divisors (see below), whose sum is σ = 144640554. Its totient is φ = 36444800.

The previous prime is 72889657. The next prime is 72889669. The reversal of 72889664 is 46698827.

It can be written as a sum of positive squares in only one way, i.e., 64128064 + 8761600 = 8008^2 + 2960^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72889669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569387 + ... + 569514.

Almost surely, 2^72889664 is an apocalyptic number.

It is an amenable number.

72889664 is a deficient number, since it is larger than the sum of its proper divisors (71750890).

72889664 is a wasteful number, since it uses less digits than its factorization.

72889664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138913 (or 1138903 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 50.

The square root of 72889664 is about 8537.5443776299. The cubic root of 72889664 is about 417.7232511034.

The spelling of 72889664 in words is "seventy-two million, eight hundred eighty-nine thousand, six hundred sixty-four".