72245864 has 8 divisors (see below), whose sum is σ = 135461010. Its totient is φ = 36122928.

The previous prime is 72245863. The next prime is 72245897. The reversal of 72245864 is 46854227.

It can be written as a sum of positive squares in only one way, i.e., 69588964 + 2656900 = 8342^2 + 1630^2 .

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 (72245863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4515359 + ... + 4515374.

Almost surely, 2^72245864 is an apocalyptic number.

It is an amenable number.

72245864 is a deficient number, since it is larger than the sum of its proper divisors (63215146).

72245864 is a wasteful number, since it uses less digits than its factorization.

72245864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9030739 (or 9030735 counting only the distinct ones).

The product of its digits is 107520, while the sum is 38.

The square root of 72245864 is about 8499.7567024004. The cubic root of 72245864 is about 416.4897615594.

The spelling of 72245864 in words is "seventy-two million, two hundred forty-five thousand, eight hundred sixty-four".