31666992 has 80 divisors (see below), whose sum is σ = 94755840. Its totient is φ = 8925696.

The previous prime is 31666981. The next prime is 31666993. The reversal of 31666992 is 29966613.

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 zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (31666993) 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, 25948 + ... + 27140.

It is an arithmetic number, because the mean of its divisors is an integer number (1184448).

Almost surely, 2^31666992 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 31666992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47377920).

31666992 is an abundant number, since it is smaller than the sum of its proper divisors (63088848).

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

31666992 is a wasteful number, since it uses less digits than its factorization.

31666992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290 (or 1284 counting only the distinct ones).

The product of its digits is 104976, while the sum is 42.

The square root of 31666992 is about 5627.3432452624. The cubic root of 31666992 is about 316.3750820395.

The spelling of 31666992 in words is "thirty-one million, six hundred sixty-six thousand, nine hundred ninety-two".