31683890 has 24 divisors (see below), whose sum is σ = 66343212. Its totient is φ = 10862880.

The previous prime is 31683889. The next prime is 31683893. The reversal of 31683890 is 9838613.

It can be written as a sum of positive squares in 2 ways, for example, as 26759929 + 4923961 = 5173^2 + 2219^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31683893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31841 + ... + 32820.

Almost surely, 2^31683890 is an apocalyptic number.

31683890 is an abundant number, since it is smaller than the sum of its proper divisors (34659322).

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

31683890 is a wasteful number, since it uses less digits than its factorization.

31683890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64682 (or 64675 counting only the distinct ones).

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

The square root of 31683890 is about 5628.8444640086. The cubic root of 31683890 is about 316.4313462561.

The spelling of 31683890 in words is "thirty-one million, six hundred eighty-three thousand, eight hundred ninety".