31980656 has 20 divisors (see below), whose sum is σ = 63475104. Its totient is φ = 15600000.

The previous prime is 31980593. The next prime is 31980659. The reversal of 31980656 is 65608913.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31980659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23720 + ... + 25031.

Almost surely, 2^31980656 is an apocalyptic number.

It is an amenable number.

31980656 is a deficient number, since it is larger than the sum of its proper divisors (31494448).

31980656 is a wasteful number, since it uses less digits than its factorization.

31980656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48800 (or 48794 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 31980656 is about 5655.1442068262. The cubic root of 31980656 is about 317.4162252365.

The spelling of 31980656 in words is "thirty-one million, nine hundred eighty thousand, six hundred fifty-six".