31172262772 has 72 divisors (see below), whose sum is σ = 68829731208. Its totient is φ = 12266956800.

The previous prime is 31172262757. The next prime is 31172262791. The reversal of 31172262772 is 27726227113.

It can be written as a sum of positive squares in 4 ways, for example, as 5404308196 + 25767954576 = 73514^2 + 160524^2 .

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 22522 + ... + 250702.

It is an arithmetic number, because the mean of its divisors is an integer number (955968489).

Almost surely, 2^31172262772 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31172262772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34414865604).

31172262772 is an abundant number, since it is smaller than the sum of its proper divisors (37657468436).

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

31172262772 is a wasteful number, since it uses less digits than its factorization.

31172262772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228257 (or 228248 counting only the distinct ones).

The product of its digits is 98784, while the sum is 40.

Adding to 31172262772 its reverse (27726227113), we get a palindrome (58898489885).

The spelling of 31172262772 in words is "thirty-one billion, one hundred seventy-two million, two hundred sixty-two thousand, seven hundred seventy-two".