31136620380 has 24 divisors (see below), whose sum is σ = 87182537232. Its totient is φ = 8303098752.

The previous prime is 31136620349. The next prime is 31136620409. The reversal of 31136620380 is 8302663113.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259471777 + ... + 259471896.

It is an arithmetic number, because the mean of its divisors is an integer number (3632605718).

Almost surely, 2^31136620380 is an apocalyptic number.

31136620380 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31136620380 is an abundant number, since it is smaller than the sum of its proper divisors (56045916852).

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

31136620380 is a wasteful number, since it uses less digits than its factorization.

31136620380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518943685 (or 518943683 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The spelling of 31136620380 in words is "thirty-one billion, one hundred thirty-six million, six hundred twenty thousand, three hundred eighty".