31286868 has 48 divisors (see below), whose sum is σ = 78099840. Its totient is φ = 9713664.

The previous prime is 31286837. The next prime is 31286891. The reversal of 31286868 is 86868213.

31286868 is a modest number, since divided by 6868 gives 3128 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20268 + ... + 21756.

It is an arithmetic number, because the mean of its divisors is an integer number (1627080).

Almost surely, 2^31286868 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 31286868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39049920).

31286868 is an abundant number, since it is smaller than the sum of its proper divisors (46812972).

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

31286868 is a wasteful number, since it uses less digits than its factorization.

31286868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616 (or 1614 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 31286868 is about 5593.4665458908. The cubic root of 31286868 is about 315.1040825112.

The spelling of 31286868 in words is "thirty-one million, two hundred eighty-six thousand, eight hundred sixty-eight".