31668018 has 16 divisors (see below), whose sum is σ = 63458400. Its totient is φ = 10535616.

The previous prime is 31668017. The next prime is 31668047. The reversal of 31668018 is 81086613.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31668018.

It is not an unprimeable number, because it can be changed into a prime (31668011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1543 + ... + 8106.

It is an arithmetic number, because the mean of its divisors is an integer number (3966150).

Almost surely, 2^31668018 is an apocalyptic number.

31668018 is an abundant number, since it is smaller than the sum of its proper divisors (31790382).

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

31668018 is a wasteful number, since it uses less digits than its factorization.

31668018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10201.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 31668018 is about 5627.4344065480. The cubic root of 31668018 is about 316.3784988183.

The spelling of 31668018 in words is "thirty-one million, six hundred sixty-eight thousand, eighteen".