31688052 has 48 divisors (see below), whose sum is σ = 81887232. Its totient is φ = 9456480.

The previous prime is 31688023. The next prime is 31688071. The reversal of 31688052 is 25088613.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

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 15 ways as a sum of consecutive naturals, for example, 7053 + ... + 10635.

It is an arithmetic number, because the mean of its divisors is an integer number (1705984).

Almost surely, 2^31688052 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31688052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40943616).

31688052 is an abundant number, since it is smaller than the sum of its proper divisors (50199180).

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

31688052 is a wasteful number, since it uses less digits than its factorization.

31688052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3668 (or 3666 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 31688052 is about 5629.2141547466. The cubic root of 31688052 is about 316.4452011374.

The spelling of 31688052 in words is "thirty-one million, six hundred eighty-eight thousand, fifty-two".