31287980106 has 64 divisors (see below), whose sum is σ = 75414447360. Its totient is φ = 9576414720.

The previous prime is 31287980083. The next prime is 31287980107. The reversal of 31287980106 is 60108978213.

It is a super-2 number, since 2×31287980106² (a number of 22 digits) contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 378006 + ... + 453281.

It is an arithmetic number, because the mean of its divisors is an integer number (1178350740).

Almost surely, 2^31287980106 is an apocalyptic number.

31287980106 is an abundant number, since it is smaller than the sum of its proper divisors (44126467254).

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

31287980106 is a wasteful number, since it uses less digits than its factorization.

31287980106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831356 (or 831350 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 31287980106 in words is "thirty-one billion, two hundred eighty-seven million, nine hundred eighty thousand, one hundred six".