31666772 has 12 divisors (see below), whose sum is σ = 55487796. Its totient is φ = 15813120.

The previous prime is 31666771. The next prime is 31666829. The reversal of 31666772 is 27766613.

It can be written as a sum of positive squares in 2 ways, for example, as 14394436 + 17272336 = 3794^2 + 4156^2 .

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31666771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1229 + ... + 8052.

It is an arithmetic number, because the mean of its divisors is an integer number (4623983).

Almost surely, 2^31666772 is an apocalyptic number.

It is an amenable number.

31666772 is a deficient number, since it is larger than the sum of its proper divisors (23821024).

31666772 is a wasteful number, since it uses less digits than its factorization.

31666772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10138 (or 10136 counting only the distinct ones).

The product of its digits is 63504, while the sum is 38.

The square root of 31666772 is about 5627.3236978159. The cubic root of 31666772 is about 316.3743493872.

The spelling of 31666772 in words is "thirty-one million, six hundred sixty-six thousand, seven hundred seventy-two".