31668663 has 16 divisors (see below), whose sum is σ = 46247040. Its totient is φ = 19156704.

The previous prime is 31668653. The next prime is 31668673. The reversal of 31668663 is 36686613.

It is an interprime number because it is at equal distance from previous prime (31668653) and next prime (31668673).

It is not a de Polignac number, because 31668663 - 2⁸ = 31668407 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31668653) 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, 4581 + ... + 9182.

It is an arithmetic number, because the mean of its divisors is an integer number (2890440).

Almost surely, 2^31668663 is an apocalyptic number.

31668663 is a deficient number, since it is larger than the sum of its proper divisors (14578377).

31668663 is a wasteful number, since it uses less digits than its factorization.

31668663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13838.

The product of its digits is 93312, while the sum is 39.

The square root of 31668663 is about 5627.4917147873. The cubic root of 31668663 is about 316.3806467556.

The spelling of 31668663 in words is "thirty-one million, six hundred sixty-eight thousand, six hundred sixty-three".