231785763240 has 128 divisors (see below), whose sum is σ = 726767769600. Its totient is φ = 59026218240.

The previous prime is 231785763239. The next prime is 231785763257. The reversal of 231785763240 is 42367587132.

It is a self number, because there is not a number n which added to its sum of digits gives 231785763240.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1640605 + ... + 1776275.

It is an arithmetic number, because the mean of its divisors is an integer number (5677873200).

Almost surely, 2^231785763240 is an apocalyptic number.

231785763240 is a gapful number since it is divisible by the number (20) 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 231785763240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (363383884800).

231785763240 is an abundant number, since it is smaller than the sum of its proper divisors (494982006360).

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

231785763240 is a wasteful number, since it uses less digits than its factorization.

231785763240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136327 (or 136323 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 48.

The spelling of 231785763240 in words is "two hundred thirty-one billion, seven hundred eighty-five million, seven hundred sixty-three thousand, two hundred forty".