31994648 has 24 divisors (see below), whose sum is σ = 69785100. Its totient is φ = 13711824.

The previous prime is 31994647. The next prime is 31994681. The reversal of 31994648 is 84649913.

It is a junction number, because it is equal to n+sod(n) for n = 31994599 and 31994608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31994647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40418 + ... + 41201.

Almost surely, 2^31994648 is an apocalyptic number.

It is an amenable number.

31994648 is an abundant number, since it is smaller than the sum of its proper divisors (37790452).

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

31994648 is a wasteful number, since it uses less digits than its factorization.

31994648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81639 (or 81628 counting only the distinct ones).

The product of its digits is 186624, while the sum is 44.

The square root of 31994648 is about 5656.3811752745. The cubic root of 31994648 is about 317.4625098851.

The spelling of 31994648 in words is "thirty-one million, nine hundred ninety-four thousand, six hundred forty-eight".