31776972 has 12 divisors (see below), whose sum is σ = 74146296. Its totient is φ = 10592320.

The previous prime is 31776971. The next prime is 31776977. The reversal of 31776972 is 27967713.

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

It is not an unprimeable number, because it can be changed into a prime (31776971) 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, 1324029 + ... + 1324052.

It is an arithmetic number, because the mean of its divisors is an integer number (6178858).

Almost surely, 2^31776972 is an apocalyptic number.

It is an amenable number.

31776972 is an abundant number, since it is smaller than the sum of its proper divisors (42369324).

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

31776972 is a wasteful number, since it uses less digits than its factorization.

31776972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2648088 (or 2648086 counting only the distinct ones).

The product of its digits is 111132, while the sum is 42.

The square root of 31776972 is about 5637.1067046846. The cubic root of 31776972 is about 316.7409175224.

The spelling of 31776972 in words is "thirty-one million, seven hundred seventy-six thousand, nine hundred seventy-two".