31543282540 has 144 divisors (see below), whose sum is σ = 84208317984. Its totient is φ = 9814425600.

The previous prime is 31543282523. The next prime is 31543282543. The reversal of 31543282540 is 4528234513.

It is a self number, because there is not a number n which added to its sum of digits gives 31543282540.

It is not an unprimeable number, because it can be changed into a prime (31543282543) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7037100 + ... + 7041580.

It is an arithmetic number, because the mean of its divisors is an integer number (584779986).

Almost surely, 2^31543282540 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 31543282540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42104158992).

31543282540 is an abundant number, since it is smaller than the sum of its proper divisors (52665035444).

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

31543282540 is a wasteful number, since it uses less digits than its factorization.

31543282540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5168 (or 5159 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 37.

The spelling of 31543282540 in words is "thirty-one billion, five hundred forty-three million, two hundred eighty-two thousand, five hundred forty".