31442432540 has 12 divisors (see below), whose sum is σ = 66029108376. Its totient is φ = 12576973008.

The previous prime is 31442432537. The next prime is 31442432561. The reversal of 31442432540 is 4523424413.

It is a junction number, because it is equal to n+sod(n) for n = 31442432497 and 31442432506.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 786060794 + ... + 786060833.

It is an arithmetic number, because the mean of its divisors is an integer number (5502425698).

Almost surely, 2^31442432540 is an apocalyptic number.

It is an amenable number.

31442432540 is an abundant number, since it is smaller than the sum of its proper divisors (34586675836).

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

31442432540 is a wasteful number, since it uses less digits than its factorization.

31442432540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572121636 (or 1572121634 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 32.

Adding to 31442432540 its reverse (4523424413), we get a palindrome (35965856953).

The spelling of 31442432540 in words is "thirty-one billion, four hundred forty-two million, four hundred thirty-two thousand, five hundred forty".