31206868 has 72 divisors (see below), whose sum is σ = 70189952. Its totient is φ = 11880000.

The previous prime is 31206853. The next prime is 31206869. The reversal of 31206868 is 86860213.

It is a super-2 number, since 2×31206868² = 1947737220738848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31206869) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 206593 + ... + 206743.

Almost surely, 2^31206868 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 31206868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35094976).

31206868 is an abundant number, since it is smaller than the sum of its proper divisors (38983084).

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

31206868 is a wasteful number, since it uses less digits than its factorization.

31206868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 31206868 is about 5586.3107682978. The cubic root of 31206868 is about 314.8352813118.

The spelling of 31206868 in words is "thirty-one million, two hundred six thousand, eight hundred sixty-eight".