31686948 has 36 divisors (see below), whose sum is σ = 82265820. Its totient is φ = 10276416.

The previous prime is 31686947. The next prime is 31686983. The reversal of 31686948 is 84968613.

It can be written as a sum of positive squares in 2 ways, for example, as 17489124 + 14197824 = 4182^2 + 3768^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (31686947) 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, 10563 + ... + 13226.

Almost surely, 2^31686948 is an apocalyptic number.

It is an amenable number.

31686948 is an abundant number, since it is smaller than the sum of its proper divisors (50578872).

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

31686948 is a wasteful number, since it uses less digits than its factorization.

31686948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23836 (or 23831 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 31686948 is about 5629.1160940240. The cubic root of 31686948 is about 316.4415261501.

The spelling of 31686948 in words is "thirty-one million, six hundred eighty-six thousand, nine hundred forty-eight".