845645784 has 64 divisors (see below), whose sum is σ = 2237207040. Its totient is φ = 265816320.

The previous prime is 845645777. The next prime is 845645833. The reversal of 845645784 is 487546548.

It is a congruent number.

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, 28404 + ... + 49980.

It is an arithmetic number, because the mean of its divisors is an integer number (34956360).

Almost surely, 2^845645784 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 845645784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1118603520).

845645784 is an abundant number, since it is smaller than the sum of its proper divisors (1391561256).

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

845645784 is a wasteful number, since it uses less digits than its factorization.

845645784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21680 (or 21676 counting only the distinct ones).

The product of its digits is 4300800, while the sum is 51.

The square root of 845645784 is about 29079.9894085263. The cubic root of 845645784 is about 945.6479730501.

The spelling of 845645784 in words is "eight hundred forty-five million, six hundred forty-five thousand, seven hundred eighty-four".