31867992 has 144 divisors (see below), whose sum is σ = 97919640. Its totient is φ = 9704448.

The previous prime is 31867987. The next prime is 31867993. The reversal of 31867992 is 29976813.

It is a super-2 number, since 2×31867992² = 2031137828224128, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

Its product of digits (163296) is a multiple of the sum of its prime factors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31867993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 328488 + ... + 328584.

Almost surely, 2^31867992 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 31867992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48959820).

31867992 is an abundant number, since it is smaller than the sum of its proper divisors (66051648).

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

31867992 is a wasteful number, since it uses less digits than its factorization.

31867992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 115 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 31867992 is about 5645.1742222893. The cubic root of 31867992 is about 317.0430469593.

The spelling of 31867992 in words is "thirty-one million, eight hundred sixty-seven thousand, nine hundred ninety-two".