31430442320 has 40 divisors (see below), whose sum is σ = 73109211336. Its totient is φ = 12566425088.

The previous prime is 31430442311. The next prime is 31430442331. The reversal of 31430442320 is 2324403413.

It can be written as a sum of positive squares in 4 ways, for example, as 20452432144 + 10978010176 = 143012^2 + 104776^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 31430442320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88274 + ... + 265806.

Almost surely, 2^31430442320 is an apocalyptic number.

It is an amenable number.

31430442320 is an abundant number, since it is smaller than the sum of its proper divisors (41678769016).

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

31430442320 is a wasteful number, since it uses less digits than its factorization.

31430442320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179759 (or 179753 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 31430442320 its reverse (2324403413), we get a palindrome (33754845733).

The spelling of 31430442320 in words is "thirty-one billion, four hundred thirty million, four hundred forty-two thousand, three hundred twenty".