31890008 has 16 divisors (see below), whose sum is σ = 59959680. Its totient is φ = 15900768.

The previous prime is 31889989. The next prime is 31890013. The reversal of 31890008 is 80009813.

It is a happy number.

It is a super-2 number, since 2×31890008² = 2033945220480128, which contains 22 as substring.

It is a congruent 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, 2360 + ... + 8327.

It is an arithmetic number, because the mean of its divisors is an integer number (3747480).

Almost surely, 2^31890008 is an apocalyptic number.

It is an amenable number.

31890008 is a deficient number, since it is larger than the sum of its proper divisors (28069672).

31890008 is a wasteful number, since it uses less digits than its factorization.

31890008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11066 (or 11062 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 31890008 is about 5647.1238697234. The cubic root of 31890008 is about 317.1160398750.

The spelling of 31890008 in words is "thirty-one million, eight hundred ninety thousand, eight".