844449781428 has 36 divisors (see below), whose sum is σ = 2328634246848. Its totient is φ = 255893873040.

The previous prime is 844449781421. The next prime is 844449781429. The reversal of 844449781428 is 824187944448.

844449781428 is a `hidden beast` number, since 8 + 4 + 4 + 44 + 97 + 81 + 428 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (844449781421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1066224076 + ... + 1066224867.

Almost surely, 2^844449781428 is an apocalyptic number.

It is an amenable number.

844449781428 is an abundant number, since it is smaller than the sum of its proper divisors (1484184465420).

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

844449781428 is a wasteful number, since it uses less digits than its factorization.

844449781428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2132448964 (or 2132448959 counting only the distinct ones).

The product of its digits is 66060288, while the sum is 63.

The spelling of 844449781428 in words is "eight hundred forty-four billion, four hundred forty-nine million, seven hundred eighty-one thousand, four hundred twenty-eight".