853728889 has 4 divisors (see below), whose sum is σ = 919400356. Its totient is φ = 788057424.

The previous prime is 853728847. The next prime is 853728907. The reversal of 853728889 is 988827358.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38340864 + 815388025 = 6192^2 + 28555^2 .

It is a cyclic number.

It is not a de Polignac number, because 853728889 - 2¹³ = 853720697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (853728839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32835714 + ... + 32835739.

It is an arithmetic number, because the mean of its divisors is an integer number (229850089).

Almost surely, 2^853728889 is an apocalyptic number.

It is an amenable number.

853728889 is a deficient number, since it is larger than the sum of its proper divisors (65671467).

853728889 is a wasteful number, since it uses less digits than its factorization.

853728889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65671466.

The product of its digits is 7741440, while the sum is 58.

The square root of 853728889 is about 29218.6394104859. The cubic root of 853728889 is about 948.6514157770.

The spelling of 853728889 in words is "eight hundred fifty-three million, seven hundred twenty-eight thousand, eight hundred eighty-nine".