318691728 has 30 divisors (see below), whose sum is σ = 891894614. Its totient is φ = 106230528.

The previous prime is 318691721. The next prime is 318691757. The reversal of 318691728 is 827196813.

318691728 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 188457984 + 130233744 = 13728^2 + 11412^2 .

It is not an unprimeable number, because it can be changed into a prime (318691721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1106425 + ... + 1106712.

Almost surely, 2^318691728 is an apocalyptic number.

It is an amenable number.

318691728 is an abundant number, since it is smaller than the sum of its proper divisors (573202886).

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

318691728 is a wasteful number, since it uses less digits than its factorization.

318691728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2213151 (or 2213142 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 318691728 is about 17851.9390543436. The cubic root of 318691728 is about 683.0569747972.

The spelling of 318691728 in words is "three hundred eighteen million, six hundred ninety-one thousand, seven hundred twenty-eight".