31816328 has 16 divisors (see below), whose sum is σ = 61111260. Its totient is φ = 15520000.

The previous prime is 31816327. The next prime is 31816373. The reversal of 31816328 is 82361813.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 31114084 + 702244 = 5578^2 + 838^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31816294 and 31816303.

It is not an unprimeable number, because it can be changed into a prime (31816327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48173 + ... + 48828.

Almost surely, 2^31816328 is an apocalyptic number.

It is an amenable number.

31816328 is a deficient number, since it is larger than the sum of its proper divisors (29294932).

31816328 is a wasteful number, since it uses less digits than its factorization.

31816328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97048 (or 97044 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 31816328 is about 5640.5964223653. The cubic root of 31816328 is about 316.8716255167.

The spelling of 31816328 in words is "thirty-one million, eight hundred sixteen thousand, three hundred twenty-eight".