318640872 has 32 divisors (see below), whose sum is σ = 869021280. Its totient is φ = 96557760.

The previous prime is 318640867. The next prime is 318640937. The reversal of 318640872 is 278046813.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 318640872.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 603223 + ... + 603750.

It is an arithmetic number, because the mean of its divisors is an integer number (27156915).

Almost surely, 2^318640872 is an apocalyptic number.

It is an amenable number.

318640872 is an abundant number, since it is smaller than the sum of its proper divisors (550380408).

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

318640872 is a wasteful number, since it uses less digits than its factorization.

318640872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206993 (or 1206989 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 318640872 is about 17850.5146144306. The cubic root of 318640872 is about 683.0206393771.

The spelling of 318640872 in words is "three hundred eighteen million, six hundred forty thousand, eight hundred seventy-two".