31355428 has 48 divisors (see below), whose sum is σ = 62265280. Its totient is φ = 13716864.

The previous prime is 31355413. The next prime is 31355431. The reversal of 31355428 is 82455313.

It is a self number, because there is not a number n which added to its sum of digits gives 31355428.

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 15 ways as a sum of consecutive naturals, for example, 82543 + ... + 82921.

Almost surely, 2^31355428 is an apocalyptic number.

It is an amenable number.

31355428 is a deficient number, since it is larger than the sum of its proper divisors (30909852).

31355428 is a wasteful number, since it uses less digits than its factorization.

31355428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476 (or 474 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

The square root of 31355428 is about 5599.5917708347. The cubic root of 31355428 is about 315.3340807636.

The spelling of 31355428 in words is "thirty-one million, three hundred fifty-five thousand, four hundred twenty-eight".