31819668 has 12 divisors (see below), whose sum is σ = 74245920. Its totient is φ = 10606552.

The previous prime is 31819639. The next prime is 31819681. The reversal of 31819668 is 86691813.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1325808 + ... + 1325831.

It is an arithmetic number, because the mean of its divisors is an integer number (6187160).

Almost surely, 2^31819668 is an apocalyptic number.

It is an amenable number.

31819668 is an abundant number, since it is smaller than the sum of its proper divisors (42426252).

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

31819668 is a wasteful number, since it uses less digits than its factorization.

31819668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2651646 (or 2651644 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 31819668 is about 5640.8924825776. The cubic root of 31819668 is about 316.8827132638.

The spelling of 31819668 in words is "thirty-one million, eight hundred nineteen thousand, six hundred sixty-eight".