31445668 has 6 divisors (see below), whose sum is σ = 55029926. Its totient is φ = 15722832.

The previous prime is 31445663. The next prime is 31445677. The reversal of 31445668 is 86654413.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 25482304 + 5963364 = 5048^2 + 2442^2 .

It is not an unprimeable number, because it can be changed into a prime (31445663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3930705 + ... + 3930712.

Almost surely, 2^31445668 is an apocalyptic number.

It is an amenable number.

31445668 is a deficient number, since it is larger than the sum of its proper divisors (23584258).

31445668 is a wasteful number, since it uses less digits than its factorization.

31445668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7861421 (or 7861419 counting only the distinct ones).

The product of its digits is 69120, while the sum is 37.

The square root of 31445668 is about 5607.6437119346. The cubic root of 31445668 is about 315.6362984290.

The spelling of 31445668 in words is "thirty-one million, four hundred forty-five thousand, six hundred sixty-eight".