28555834229 has 4 divisors (see below), whose sum is σ = 30752436876. Its totient is φ = 26359231584.

The previous prime is 28555834213. The next prime is 28555834247. The reversal of 28555834229 is 92243855582.

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 6532680625 + 22023153604 = 80825^2 + 148402^2 .

It is a cyclic number.

It is not a de Polignac number, because 28555834229 - 2⁴ = 28555834213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28555834829) 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, 1098301304 + ... + 1098301329.

It is an arithmetic number, because the mean of its divisors is an integer number (7688109219).

Almost surely, 2^28555834229 is an apocalyptic number.

It is an amenable number.

28555834229 is a deficient number, since it is larger than the sum of its proper divisors (2196602647).

28555834229 is a wasteful number, since it uses less digits than its factorization.

28555834229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2196602646.

The product of its digits is 6912000, while the sum is 53.

The spelling of 28555834229 in words is "twenty-eight billion, five hundred fifty-five million, eight hundred thirty-four thousand, two hundred twenty-nine".