844488666 has 96 divisors (see below), whose sum is σ = 2227505280. Its totient is φ = 234726336.

The previous prime is 844488643. The next prime is 844488679. The reversal of 844488666 is 666884448.

It is a super-2 number, since 2×844488666² = 1426322214004919112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 122520 + ... + 129228.

It is an arithmetic number, because the mean of its divisors is an integer number (23203180).

Almost surely, 2^844488666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 844488666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1113752640).

844488666 is an abundant number, since it is smaller than the sum of its proper divisors (1383016614).

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

844488666 is a wasteful number, since it uses less digits than its factorization.

844488666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6770 (or 6758 counting only the distinct ones).

The product of its digits is 7077888, while the sum is 54.

The square root of 844488666 is about 29060.0871643565. The cubic root of 844488666 is about 945.2164583515.

The spelling of 844488666 in words is "eight hundred forty-four million, four hundred eighty-eight thousand, six hundred sixty-six".