31430233240 has 128 divisors (see below), whose sum is σ = 84895672320. Its totient is φ = 10238976000.

The previous prime is 31430233229. The next prime is 31430233243. The reversal of 31430233240 is 4233203413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31430233243) 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, 956280 + ... + 988600.

It is an arithmetic number, because the mean of its divisors is an integer number (663247440).

Almost surely, 2^31430233240 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 31430233240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42447836160).

31430233240 is an abundant number, since it is smaller than the sum of its proper divisors (53465439080).

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

31430233240 is a wasteful number, since it uses less digits than its factorization.

31430233240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32513 (or 32509 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 25.

Adding to 31430233240 its reverse (4233203413), we get a palindrome (35663436653).

The spelling of 31430233240 in words is "thirty-one billion, four hundred thirty million, two hundred thirty-three thousand, two hundred forty".