311728 has 10 divisors (see below), whose sum is σ = 604004. Its totient is φ = 155856.

The previous prime is 311713. The next prime is 311737. The reversal of 311728 is 827113.

It is a junction number, because it is equal to n+sod(n) for n = 311699 and 311708.

It is an unprimeable number.

311728 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9726 + ... + 9757.

2³¹¹⁷²⁸ is an apocalyptic number.

It is an amenable number.

311728 is a deficient number, since it is larger than the sum of its proper divisors (292276).

311728 is a wasteful number, since it uses less digits than its factorization.

311728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19491 (or 19485 counting only the distinct ones).

The product of its digits is 336, while the sum is 22.

The square root of 311728 is about 558.3260696045. The cubic root of 311728 is about 67.8045135250.

The spelling of 311728 in words is "three hundred eleven thousand, seven hundred twenty-eight".