31665668 has 6 divisors (see below), whose sum is σ = 55414926. Its totient is φ = 15832832.

The previous prime is 31665661. The next prime is 31665671. The reversal of 31665668 is 86656613.

It can be written as a sum of positive squares in only one way, i.e., 31158724 + 506944 = 5582^2 + 712^2 .

It is not an unprimeable number, because it can be changed into a prime (31665661) 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 as a sum of consecutive naturals, namely, 3958205 + ... + 3958212.

It is an arithmetic number, because the mean of its divisors is an integer number (9235821).

Almost surely, 2^31665668 is an apocalyptic number.

It is an amenable number.

31665668 is a deficient number, since it is larger than the sum of its proper divisors (23749258).

31665668 is a wasteful number, since it uses less digits than its factorization.

31665668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7916421 (or 7916419 counting only the distinct ones).

The product of its digits is 155520, while the sum is 41.

The square root of 31665668 is about 5627.2256041499. The cubic root of 31665668 is about 316.3706727537.

The spelling of 31665668 in words is "thirty-one million, six hundred sixty-five thousand, six hundred sixty-eight".