31530440000 has 70 divisors (see below), whose sum is σ = 78185342994. Its totient is φ = 12612160000.

The previous prime is 31530439991. The next prime is 31530440003. The reversal of 31530440000 is 4403513.

It can be written as a sum of positive squares in 5 ways, for example, as 4964047936 + 26566392064 = 70456^2 + 162992^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31530440003) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 354131 + ... + 434130.

Almost surely, 2^31530440000 is an apocalyptic number.

It is an amenable number.

31530440000 is an abundant number, since it is smaller than the sum of its proper divisors (46654902994).

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

31530440000 is an frugal number, since it uses more digits than its factorization.

31530440000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788293 (or 788268 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 31530440000 its reverse (4403513), we get a palindrome (31534843513).

The spelling of 31530440000 in words is "thirty-one billion, five hundred thirty million, four hundred forty thousand".