840645036 has 144 divisors (see below), whose sum is σ = 2805304320. Its totient is φ = 205493760.

The previous prime is 840645023. The next prime is 840645049. The reversal of 840645036 is 630546048.

840645036 is a `hidden beast` number, since 8 + 4 + 0 + 645 + 0 + 3 + 6 = 666.

840645036 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (840645023) and next prime (840645049).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38205 + ... + 56043.

It is an arithmetic number, because the mean of its divisors is an integer number (19481280).

Almost surely, 2^840645036 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 840645036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1402652160).

840645036 is an abundant number, since it is smaller than the sum of its proper divisors (1964659284).

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

840645036 is a wasteful number, since it uses less digits than its factorization.

840645036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17884 (or 17879 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 840645036 is about 28993.8792851181. The cubic root of 840645036 is about 943.7802487505.

The spelling of 840645036 in words is "eight hundred forty million, six hundred forty-five thousand, thirty-six".