31542425240 has 32 divisors (see below), whose sum is σ = 71673143760. Its totient is φ = 12492048000.

The previous prime is 31542425207. The next prime is 31542425251. The reversal of 31542425240 is 4252424513.

It is a junction number, because it is equal to n+sod(n) for n = 31542425197 and 31542425206.

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, 3899726 + ... + 3907805.

Almost surely, 2^31542425240 is an apocalyptic number.

It is an amenable number.

31542425240 is an abundant number, since it is smaller than the sum of its proper divisors (40130718520).

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

31542425240 is a wasteful number, since it uses less digits than its factorization.

31542425240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7807643 (or 7807639 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 32.

Adding to 31542425240 its reverse (4252424513), we get a palindrome (35794849753).

The spelling of 31542425240 in words is "thirty-one billion, five hundred forty-two million, four hundred twenty-five thousand, two hundred forty".