31489208920 has 96 divisors (see below), whose sum is σ = 80056058400. Its totient is φ = 11121217536.

The previous prime is 31489208911. The next prime is 31489208983. The reversal of 31489208920 is 2980298413.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54216 + ... + 256744.

It is an arithmetic number, because the mean of its divisors is an integer number (833917275).

Almost surely, 2^31489208920 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 31489208920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40028029200).

31489208920 is an abundant number, since it is smaller than the sum of its proper divisors (48566849480).

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

31489208920 is a wasteful number, since it uses less digits than its factorization.

31489208920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202589 (or 202572 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 31489208920 in words is "thirty-one billion, four hundred eighty-nine million, two hundred eight thousand, nine hundred twenty".