31428734020 has 96 divisors (see below), whose sum is σ = 70887398400. Its totient is φ = 11662977024.

The previous prime is 31428734017. The next prime is 31428734041. The reversal of 31428734020 is 2043782413.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8017621 + ... + 8021539.

It is an arithmetic number, because the mean of its divisors is an integer number (738410400).

Almost surely, 2^31428734020 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 31428734020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35443699200).

31428734020 is an abundant number, since it is smaller than the sum of its proper divisors (39458664380).

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

31428734020 is a wasteful number, since it uses less digits than its factorization.

31428734020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4277 (or 4275 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 34.

The spelling of 31428734020 in words is "thirty-one billion, four hundred twenty-eight million, seven hundred thirty-four thousand, twenty".