31890368 has 28 divisors (see below), whose sum is σ = 67007232. Its totient is φ = 15006720.

The previous prime is 31890367. The next prime is 31890371. The reversal of 31890368 is 86309813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31890367) by changing a digit.

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, 13568 + ... + 15743.

Almost surely, 2^31890368 is an apocalyptic number.

It is an amenable number.

31890368 is an abundant number, since it is smaller than the sum of its proper divisors (35116864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31890368 is a wasteful number, since it uses less digits than its factorization.

31890368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29340 (or 29330 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 31890368 is about 5647.1557442663. The cubic root of 31890368 is about 317.1172331572.

The spelling of 31890368 in words is "thirty-one million, eight hundred ninety thousand, three hundred sixty-eight".