31543290128 has 160 divisors (see below), whose sum is σ = 73311879168. Its totient is φ = 12864499200.

The previous prime is 31543290127. The next prime is 31543290143. The reversal of 31543290128 is 82109234513.

It is a junction number, because it is equal to n+sod(n) for n = 31543290091 and 31543290100.

It is not an unprimeable number, because it can be changed into a prime (31543290127) 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, 73186073 + ... + 73186503.

Almost surely, 2^31543290128 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 31543290128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36655939584).

31543290128 is an abundant number, since it is smaller than the sum of its proper divisors (41768589040).

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

31543290128 is a wasteful number, since it uses less digits than its factorization.

31543290128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781 (or 775 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 31543290128 in words is "thirty-one billion, five hundred forty-three million, two hundred ninety thousand, one hundred twenty-eight".