853489644 has 96 divisors (see below), whose sum is σ = 2397696000. Its totient is φ = 235952640.

The previous prime is 853489643. The next prime is 853489699. The reversal of 853489644 is 446984358.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (853489643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124252 + ... + 130940.

It is an arithmetic number, because the mean of its divisors is an integer number (24976000).

Almost surely, 2^853489644 is an apocalyptic number.

853489644 is a gapful number since it is divisible by the number (84) 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 853489644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1198848000).

853489644 is an abundant number, since it is smaller than the sum of its proper divisors (1544206356).

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

853489644 is a wasteful number, since it uses less digits than its factorization.

853489644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6748 (or 6732 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 51.

The square root of 853489644 is about 29214.5450760405. The cubic root of 853489644 is about 948.5627922827.

The spelling of 853489644 in words is "eight hundred fifty-three million, four hundred eighty-nine thousand, six hundred forty-four".