31640112 has 80 divisors (see below), whose sum is σ = 103802880. Its totient is φ = 9039168.

The previous prime is 31640039. The next prime is 31640129. The reversal of 31640112 is 21104613.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2208 + ... + 8255.

It is an arithmetic number, because the mean of its divisors is an integer number (1297536).

Almost surely, 2^31640112 is an apocalyptic number.

It is an amenable number.

31640112 is an abundant number, since it is smaller than the sum of its proper divisors (72162768).

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

31640112 is a wasteful number, since it uses less digits than its factorization.

31640112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10487 (or 10475 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 31640112 is about 5624.9543998152. The cubic root of 31640112 is about 316.2855401220.

Adding to 31640112 its reverse (21104613), we get a palindrome (52744725).

The spelling of 31640112 in words is "thirty-one million, six hundred forty thousand, one hundred twelve".