31787403252 has 72 divisors (see below), whose sum is σ = 81641222208. Its totient is φ = 9618977280.

The previous prime is 31787403251. The next prime is 31787403311. The reversal of 31787403252 is 25230478713.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31787403251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1040548 + ... + 1070660.

It is an arithmetic number, because the mean of its divisors is an integer number (1133905864).

Almost surely, 2^31787403252 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 31787403252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40820611104).

31787403252 is an abundant number, since it is smaller than the sum of its proper divisors (49853818956).

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

31787403252 is a wasteful number, since it uses less digits than its factorization.

31787403252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30869 (or 30856 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 42.

The spelling of 31787403252 in words is "thirty-one billion, seven hundred eighty-seven million, four hundred three thousand, two hundred fifty-two".