31786281340 has 72 divisors (see below), whose sum is σ = 74044887840. Its totient is φ = 11452510080.

The previous prime is 31786281283. The next prime is 31786281341. The reversal of 31786281340 is 4318268713.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31786281341) 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 23 ways as a sum of consecutive naturals, for example, 203529 + ... + 324031.

It is an arithmetic number, because the mean of its divisors is an integer number (1028401220).

Almost surely, 2^31786281340 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 31786281340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37022443920).

31786281340 is an abundant number, since it is smaller than the sum of its proper divisors (42258606500).

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

31786281340 is a wasteful number, since it uses less digits than its factorization.

31786281340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120643 (or 120630 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 31786281340 in words is "thirty-one billion, seven hundred eighty-six million, two hundred eighty-one thousand, three hundred forty".