31320000000 has 640 divisors, whose sum is σ = 119882505600. Its totient is φ = 8064000000.

The previous prime is 31319999989. The next prime is 31320000001. The reversal of 31320000000 is 2313.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320000001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1079999986 + ... + 1080000014.

It is an arithmetic number, because the mean of its divisors is an integer number (187316415).

Almost surely, 2^31320000000 is an apocalyptic number.

31320000000 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31320000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59941252800).

31320000000 is an abundant number, since it is smaller than the sum of its proper divisors (88562505600).

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

31320000000 is an frugal number, since it uses more digits than its factorization.

31320000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91 (or 39 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 9.

Adding to 31320000000 its reverse (2313), we get a palindrome (31320002313).

The spelling of 31320000000 in words is "thirty-one billion, three hundred twenty million", and thus it is an aban number.