840791664 has 120 divisors (see below), whose sum is σ = 2524682160. Its totient is φ = 270563328.

The previous prime is 840791659. The next prime is 840791711. The reversal of 840791664 is 466197048.

840791664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109024 + ... + 116480.

It is an arithmetic number, because the mean of its divisors is an integer number (21039018).

Almost surely, 2^840791664 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 840791664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1262341080).

840791664 is an abundant number, since it is smaller than the sum of its proper divisors (1683890496).

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

840791664 is a wasteful number, since it uses less digits than its factorization.

840791664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7509 (or 7491 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 840791664 is about 28996.4077775162. The cubic root of 840791664 is about 943.8351179519.

The spelling of 840791664 in words is "eight hundred forty million, seven hundred ninety-one thousand, six hundred sixty-four".