31540452440 has 32 divisors (see below), whose sum is σ = 81104021280. Its totient is φ = 10813869312.

The previous prime is 31540452431. The next prime is 31540452451. The reversal of 31540452440 is 4425404513.

It is a junction number, because it is equal to n+sod(n) for n = 31540452397 and 31540452406.

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, 56321957 + ... + 56322516.

It is an arithmetic number, because the mean of its divisors is an integer number (2534500665).

Almost surely, 2^31540452440 is an apocalyptic number.

It is an amenable number.

31540452440 is an abundant number, since it is smaller than the sum of its proper divisors (49563568840).

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

31540452440 is a wasteful number, since it uses less digits than its factorization.

31540452440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112644491 (or 112644487 counting only the distinct ones).

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

Adding to 31540452440 its reverse (4425404513), we get a palindrome (35965856953).

The spelling of 31540452440 in words is "thirty-one billion, five hundred forty million, four hundred fifty-two thousand, four hundred forty".