31755640368 has 80 divisors (see below), whose sum is σ = 86037278976. Its totient is φ = 10073521920.

The previous prime is 31755640363. The next prime is 31755640369. The reversal of 31755640368 is 86304655713.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (31755640363) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144483 + ... + 290493.

Almost surely, 2^31755640368 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 31755640368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43018639488).

31755640368 is an abundant number, since it is smaller than the sum of its proper divisors (54281638608).

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

31755640368 is a wasteful number, since it uses less digits than its factorization.

31755640368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146242 (or 146236 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 48.

The spelling of 31755640368 in words is "thirty-one billion, seven hundred fifty-five million, six hundred forty thousand, three hundred sixty-eight".