31520334540 has 24 divisors (see below), whose sum is σ = 88256936880. Its totient is φ = 8405422528.

The previous prime is 31520334533. The next prime is 31520334541. The reversal of 31520334540 is 4543302513.

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 = 31520334498 and 31520334507.

It is not an unprimeable number, because it can be changed into a prime (31520334541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262669395 + ... + 262669514.

It is an arithmetic number, because the mean of its divisors is an integer number (3677372370).

Almost surely, 2^31520334540 is an apocalyptic number.

31520334540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31520334540 is an abundant number, since it is smaller than the sum of its proper divisors (56736602340).

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

31520334540 is a wasteful number, since it uses less digits than its factorization.

31520334540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525338921 (or 525338919 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 30.

The spelling of 31520334540 in words is "thirty-one billion, five hundred twenty million, three hundred thirty-four thousand, five hundred forty".