72709064 has 8 divisors (see below), whose sum is σ = 136329510. Its totient is φ = 36354528.

The previous prime is 72709037. The next prime is 72709069. The reversal of 72709064 is 46090727.

It can be written as a sum of positive squares in only one way, i.e., 46104100 + 26604964 = 6790^2 + 5158^2 .

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

It is not an unprimeable number, because it can be changed into a prime (72709069) 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 as a sum of consecutive naturals, namely, 4544309 + ... + 4544324.

Almost surely, 2^72709064 is an apocalyptic number.

It is an amenable number.

72709064 is a deficient number, since it is larger than the sum of its proper divisors (63620446).

72709064 is a wasteful number, since it uses less digits than its factorization.

72709064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9088639 (or 9088635 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 72709064 is about 8526.9610061264. The cubic root of 72709064 is about 417.3779656957.

The spelling of 72709064 in words is "seventy-two million, seven hundred nine thousand, sixty-four".