31856428 has 12 divisors (see below), whose sum is σ = 55793920. Its totient is φ = 15915312.

The previous prime is 31856417. The next prime is 31856431. The reversal of 31856428 is 82465813.

It is a happy number.

It is an unprimeable number.

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, 4258 + ... + 9046.

Almost surely, 2^31856428 is an apocalyptic number.

It is an amenable number.

31856428 is a deficient number, since it is larger than the sum of its proper divisors (23937492).

31856428 is a wasteful number, since it uses less digits than its factorization.

31856428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6456 (or 6454 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 31856428 is about 5644.1498917020. The cubic root of 31856428 is about 317.0046936449.

The spelling of 31856428 in words is "thirty-one million, eight hundred fifty-six thousand, four hundred twenty-eight".