840777216 has 80 divisors (see below), whose sum is σ = 2248439424. Its totient is φ = 279189504.

The previous prime is 840777191. The next prime is 840777221. The reversal of 840777216 is 612777048.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 470661 + ... + 472443.

Almost surely, 2^840777216 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 840777216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1124219712).

840777216 is an abundant number, since it is smaller than the sum of its proper divisors (1407662208).

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

840777216 is a wasteful number, since it uses less digits than its factorization.

840777216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2111 (or 2095 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 42.

The square root of 840777216 is about 28996.1586421374. The cubic root of 840777216 is about 943.8297116947.

The spelling of 840777216 in words is "eight hundred forty million, seven hundred seventy-seven thousand, two hundred sixteen".