845668864 has 40 divisors (see below), whose sum is σ = 1717449228. Its totient is φ = 415887360.

The previous prime is 845668861. The next prime is 845668867. The reversal of 845668864 is 468866548.

It is an interprime number because it is at equal distance from previous prime (845668861) and next prime (845668867).

It can be written as a sum of positive squares in 2 ways, for example, as 834054400 + 11614464 = 28880^2 + 3408^2 .

It is not an unprimeable number, because it can be changed into a prime (845668861) 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, 17694 + ... + 44770.

Almost surely, 2^845668864 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 845668864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (858724614).

845668864 is an abundant number, since it is smaller than the sum of its proper divisors (871780364).

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

845668864 is an equidigital number, since it uses as much as digits as its factorization.

845668864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27156 (or 27140 counting only the distinct ones).

The product of its digits is 8847360, while the sum is 55.

The square root of 845668864 is about 29080.3862422768. The cubic root of 845668864 is about 945.6565760834.

The spelling of 845668864 in words is "eight hundred forty-five million, six hundred sixty-eight thousand, eight hundred sixty-four".