31490428 has 12 divisors (see below), whose sum is σ = 55162800. Its totient is φ = 15729632.

The previous prime is 31490399. The next prime is 31490447. The reversal of 31490428 is 82409413.

It is a self number, because there is not a number n which added to its sum of digits gives 31490428.

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, 1473 + ... + 8071.

It is an arithmetic number, because the mean of its divisors is an integer number (4596900).

Almost surely, 2^31490428 is an apocalyptic number.

It is an amenable number.

31490428 is a deficient number, since it is larger than the sum of its proper divisors (23672372).

31490428 is a wasteful number, since it uses less digits than its factorization.

31490428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7796 (or 7794 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 31490428 is about 5611.6332738339. The cubic root of 31490428 is about 315.7859871213.

The spelling of 31490428 in words is "thirty-one million, four hundred ninety thousand, four hundred twenty-eight".