31971768 has 32 divisors (see below), whose sum is σ = 80643600. Its totient is φ = 10562048.

The previous prime is 31971763. The next prime is 31971769. The reversal of 31971768 is 86717913.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31971761) 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, 3183 + ... + 8606.

Almost surely, 2^31971768 is an apocalyptic number.

It is an amenable number.

31971768 is an abundant number, since it is smaller than the sum of its proper divisors (48671832).

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

31971768 is a wasteful number, since it uses less digits than its factorization.

31971768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11911 (or 11907 counting only the distinct ones).

The product of its digits is 63504, while the sum is 42.

The square root of 31971768 is about 5654.3583190314. The cubic root of 31971768 is about 317.3868172844.

The spelling of 31971768 in words is "thirty-one million, nine hundred seventy-one thousand, seven hundred sixty-eight".