31985428 has 12 divisors (see below), whose sum is σ = 57780352. Its totient is φ = 15476760.

The previous prime is 31985399. The next prime is 31985431. The reversal of 31985428 is 82458913.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128850 + ... + 129097.

Almost surely, 2^31985428 is an apocalyptic number.

It is an amenable number.

31985428 is a deficient number, since it is larger than the sum of its proper divisors (25794924).

31985428 is a wasteful number, since it uses less digits than its factorization.

31985428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257982 (or 257980 counting only the distinct ones).

The product of its digits is 69120, while the sum is 40.

The square root of 31985428 is about 5655.5661078269. The cubic root of 31985428 is about 317.4320122265.

The spelling of 31985428 in words is "thirty-one million, nine hundred eighty-five thousand, four hundred twenty-eight".