31109872680 has 384 divisors, whose sum is σ = 114656256000. Its totient is φ = 7273981440.

The previous prime is 31109872679. The next prime is 31109872681. The reversal of 31109872680 is 8627890113.

It is an interprime number because it is at equal distance from previous prime (31109872679) and next prime (31109872681).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (31109872681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4873731 + ... + 4880109.

It is an arithmetic number, because the mean of its divisors is an integer number (298584000).

Almost surely, 2^31109872680 is an apocalyptic number.

31109872680 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31109872680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57328128000).

31109872680 is an abundant number, since it is smaller than the sum of its proper divisors (83546383320).

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

31109872680 is a wasteful number, since it uses less digits than its factorization.

31109872680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6469 (or 6462 counting only the distinct ones).

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

The spelling of 31109872680 in words is "thirty-one billion, one hundred nine million, eight hundred seventy-two thousand, six hundred eighty".