31689190 has 48 divisors (see below), whose sum is σ = 65458368. Its totient is φ = 11002368.

The previous prime is 31689157. The next prime is 31689247. The reversal of 31689190 is 9198613.

It is a super-2 number, since 2×31689190² = 2008409525712200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28179 + ... + 29281.

It is an arithmetic number, because the mean of its divisors is an integer number (1363716).

Almost surely, 2^31689190 is an apocalyptic number.

31689190 is an abundant number, since it is smaller than the sum of its proper divisors (33769178).

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

31689190 is a wasteful number, since it uses less digits than its factorization.

31689190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153 (or 1140 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 31689190 is about 5629.3152336674. The cubic root of 31689190 is about 316.4489892142.

The spelling of 31689190 in words is "thirty-one million, six hundred eighty-nine thousand, one hundred ninety".