31540324440 has 64 divisors (see below), whose sum is σ = 95557851360. Its totient is φ = 8327475200.

The previous prime is 31540324429. The next prime is 31540324469. The reversal of 31540324440 is 4442304513.

It is a super-2 number, since 2×31540324440² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 31540324398 and 31540324407.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1289049 + ... + 1313288.

Almost surely, 2^31540324440 is an apocalyptic number.

31540324440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31540324440 is an abundant number, since it is smaller than the sum of its proper divisors (64017526920).

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

31540324440 is a wasteful number, since it uses less digits than its factorization.

31540324440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2602452 (or 2602448 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 30.

Adding to 31540324440 its reverse (4442304513), we get a palindrome (35982628953).

The spelling of 31540324440 in words is "thirty-one billion, five hundred forty million, three hundred twenty-four thousand, four hundred forty".