31868316 has 60 divisors (see below), whose sum is σ = 85377600. Its totient is φ = 10359360.

The previous prime is 31868311. The next prime is 31868321. The reversal of 31868316 is 61386813.

It is an interprime number because it is at equal distance from previous prime (31868311) and next prime (31868321).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31868311) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 12085 + ... + 14483.

It is an arithmetic number, because the mean of its divisors is an integer number (1422960).

Almost surely, 2^31868316 is an apocalyptic number.

31868316 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31868316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42688800).

31868316 is an abundant number, since it is smaller than the sum of its proper divisors (53509284).

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

31868316 is a wasteful number, since it uses less digits than its factorization.

31868316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2456 (or 2445 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 31868316 is about 5645.2029192935. The cubic root of 31868316 is about 317.0441214083.

The spelling of 31868316 in words is "thirty-one million, eight hundred sixty-eight thousand, three hundred sixteen".