31643942850 has 144 divisors (see below), whose sum is σ = 94510450944. Its totient is φ = 7537968000.

The previous prime is 31643942849. The next prime is 31643942861. The reversal of 31643942850 is 5824934613.

It is a super-2 number, since 2×31643942850² (a number of 22 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 31643942796 and 31643942805.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 94105 + ... + 268595.

It is an arithmetic number, because the mean of its divisors is an integer number (656322576).

Almost surely, 2^31643942850 is an apocalyptic number.

31643942850 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31643942850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47255225472).

31643942850 is an abundant number, since it is smaller than the sum of its proper divisors (62866508094).

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

31643942850 is a wasteful number, since it uses less digits than its factorization.

31643942850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174553 (or 174545 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 31643942850 in words is "thirty-one billion, six hundred forty-three million, nine hundred forty-two thousand, eight hundred fifty".