840645843632 has 80 divisors (see below), whose sum is σ = 1923469009152. Its totient is φ = 348388750080.

The previous prime is 840645843617. The next prime is 840645843673. The reversal of 840645843632 is 236348546048.

840645843632 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53207 + ... + 1297737.

Almost surely, 2^840645843632 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 840645843632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (961734504576).

840645843632 is an abundant number, since it is smaller than the sum of its proper divisors (1082823165520).

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

840645843632 is a wasteful number, since it uses less digits than its factorization.

840645843632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244746 (or 1244740 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 53.

The spelling of 840645843632 in words is "eight hundred forty billion, six hundred forty-five million, eight hundred forty-three thousand, six hundred thirty-two".