72318740 has 24 divisors (see below), whose sum is σ = 163552200. Its totient is φ = 26702208.

The previous prime is 72318713. The next prime is 72318749. The reversal of 72318740 is 4781327.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1993744 + 70324996 = 1412^2 + 8386^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72318697 and 72318706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72318749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138815 + ... + 139334.

It is an arithmetic number, because the mean of its divisors is an integer number (6814675).

Almost surely, 2^72318740 is an apocalyptic number.

It is an amenable number.

72318740 is an abundant number, since it is smaller than the sum of its proper divisors (91233460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72318740 is a wasteful number, since it uses less digits than its factorization.

72318740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278171 (or 278169 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 72318740 is about 8504.0425680967. The cubic root of 72318740 is about 416.6297553080.

The spelling of 72318740 in words is "seventy-two million, three hundred eighteen thousand, seven hundred forty".