31880112 has 80 divisors (see below), whose sum is σ = 90768000. Its totient is φ = 9641280.

The previous prime is 31880099. The next prime is 31880129. The reversal of 31880112 is 21108813.

It is a super-2 number, since 2×31880112² = 2032683082265088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63639 + ... + 64137.

It is an arithmetic number, because the mean of its divisors is an integer number (1134600).

Almost surely, 2^31880112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31880112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45384000).

31880112 is an abundant number, since it is smaller than the sum of its proper divisors (58887888).

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

31880112 is a wasteful number, since it uses less digits than its factorization.

31880112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 31880112 is about 5646.2476034974. The cubic root of 31880112 is about 317.0832343538.

Adding to 31880112 its reverse (21108813), we get a palindrome (52988925).

It can be divided in two parts, 318801 and 12, that added together give a palindrome (318813).

The spelling of 31880112 in words is "thirty-one million, eight hundred eighty thousand, one hundred twelve".