845816640 has 112 divisors (see below), whose sum is σ = 2843491392. Its totient is φ = 212279296.

The previous prime is 845816599. The next prime is 845816641. The reversal of 845816640 is 46618548.

It is a junction number, because it is equal to n+sod(n) for n = 845816592 and 845816601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845816641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9594 + ... + 42233.

It is an arithmetic number, because the mean of its divisors is an integer number (25388316).

Almost surely, 2^845816640 is an apocalyptic number.

845816640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 845816640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1421745696).

845816640 is an abundant number, since it is smaller than the sum of its proper divisors (1997674752).

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

845816640 is a wasteful number, since it uses less digits than its factorization.

845816640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51864 (or 51854 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 42.

The square root of 845816640 is about 29082.9269503604. The cubic root of 845816640 is about 945.7116556435.

The spelling of 845816640 in words is "eight hundred forty-five million, eight hundred sixteen thousand, six hundred forty".