31720270260 has 96 divisors (see below), whose sum is σ = 101746536192. Its totient is φ = 7233085440.

The previous prime is 31720270243. The next prime is 31720270261. The reversal of 31720270260 is 6207202713.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31720270261) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 87124 + ... + 266516.

It is an arithmetic number, because the mean of its divisors is an integer number (1059859752).

Almost surely, 2^31720270260 is an apocalyptic number.

31720270260 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 31720270260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50873268096).

31720270260 is an abundant number, since it is smaller than the sum of its proper divisors (70026265932).

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

31720270260 is a wasteful number, since it uses less digits than its factorization.

31720270260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179833 (or 179831 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 30.

Adding to 31720270260 its reverse (6207202713), we get a palindrome (37927472973).

The spelling of 31720270260 in words is "thirty-one billion, seven hundred twenty million, two hundred seventy thousand, two hundred sixty".