840802656 has 24 divisors (see below), whose sum is σ = 2207107224. Its totient is φ = 280267520.

The previous prime is 840802637. The next prime is 840802657. The reversal of 840802656 is 656208048.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840802657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4379085 + ... + 4379276.

It is an arithmetic number, because the mean of its divisors is an integer number (91962801).

Almost surely, 2^840802656 is an apocalyptic number.

It is an amenable number.

840802656 is an abundant number, since it is smaller than the sum of its proper divisors (1366304568).

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

840802656 is a wasteful number, since it uses less digits than its factorization.

840802656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8758374 (or 8758366 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 840802656 is about 28996.5973176164. The cubic root of 840802656 is about 943.8392309765.

It can be divided in two parts, 84080 and 2656, that added together give a triangular number (86736 = T₄₁₆).

The spelling of 840802656 in words is "eight hundred forty million, eight hundred two thousand, six hundred fifty-six".