228128813 has 8 divisors (see below), whose sum is σ = 249236256. Its totient is φ = 207082800.

The previous prime is 228128773. The next prime is 228128827. The reversal of 228128813 is 318821822.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 228128813 - 2¹⁰ = 228127789 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 (228128833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7406 + ... + 22607.

It is an arithmetic number, because the mean of its divisors is an integer number (31154532).

Almost surely, 2^228128813 is an apocalyptic number.

It is an amenable number.

228128813 is a deficient number, since it is larger than the sum of its proper divisors (21107443).

228128813 is a wasteful number, since it uses less digits than its factorization.

228128813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30715.

The product of its digits is 12288, while the sum is 35.

The square root of 228128813 is about 15103.9336929159. The cubic root of 228128813 is about 611.0265015118.

The spelling of 228128813 in words is "two hundred twenty-eight million, one hundred twenty-eight thousand, eight hundred thirteen".