31287980108 has 72 divisors (see below), whose sum is σ = 70641092256. Its totient is φ = 11860611840.

The previous prime is 31287980107. The next prime is 31287980117. The reversal of 31287980108 is 80108978213.

It is not an unprimeable number, because it can be changed into a prime (31287980107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 560 + ... + 250152.

Almost surely, 2^31287980108 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 31287980108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35320546128).

31287980108 is an abundant number, since it is smaller than the sum of its proper divisors (39353112148).

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

31287980108 is a wasteful number, since it uses less digits than its factorization.

31287980108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249663 (or 249650 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 47.

The spelling of 31287980108 in words is "thirty-one billion, two hundred eighty-seven million, nine hundred eighty thousand, one hundred eight".