31871868 has 48 divisors (see below), whose sum is σ = 86607360. Its totient is φ = 8933184.

The previous prime is 31871857. The next prime is 31871869. The reversal of 31871868 is 86817813.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31871869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 873 + ... + 8031.

It is an arithmetic number, because the mean of its divisors is an integer number (1804320).

Almost surely, 2^31871868 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 31871868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43303680).

31871868 is an abundant number, since it is smaller than the sum of its proper divisors (54735492).

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

31871868 is a wasteful number, since it uses less digits than its factorization.

31871868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7226 (or 7224 counting only the distinct ones).

The product of its digits is 64512, while the sum is 42.

The square root of 31871868 is about 5645.5175139220. The cubic root of 31871868 is about 317.0559000757.

The spelling of 31871868 in words is "thirty-one million, eight hundred seventy-one thousand, eight hundred sixty-eight".