844991638080 has 224 divisors, whose sum is σ = 2765196074880. Its totient is φ = 218458275840.

The previous prime is 844991638021. The next prime is 844991638103. The reversal of 844991638080 is 80836199448.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9938791 + ... + 10023449.

Almost surely, 2^844991638080 is an apocalyptic number.

844991638080 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 844991638080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1382598037440).

844991638080 is an abundant number, since it is smaller than the sum of its proper divisors (1920204436800).

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

844991638080 is a wasteful number, since it uses less digits than its factorization.

844991638080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84997 (or 84987 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 60.

The spelling of 844991638080 in words is "eight hundred forty-four billion, nine hundred ninety-one million, six hundred thirty-eight thousand, eighty".