228030813 has 6 divisors (see below), whose sum is σ = 329377854. Its totient is φ = 152020536.

The previous prime is 228030791. The next prime is 228030821. The reversal of 228030813 is 318030822.

It can be written as a sum of positive squares in only one way, i.e., 141205689 + 86825124 = 11883^2 + 9318^2 .

It is not a de Polignac number, because 228030813 - 2⁸ = 228030557 is a prime.

It is a super-3 number, since 3×228030813³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228030833) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12668370 + ... + 12668387.

It is an arithmetic number, because the mean of its divisors is an integer number (54896309).

Almost surely, 2^228030813 is an apocalyptic number.

It is an amenable number.

228030813 is a deficient number, since it is larger than the sum of its proper divisors (101347041).

228030813 is a wasteful number, since it uses less digits than its factorization.

228030813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25336763 (or 25336760 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 228030813 is about 15100.6891564591. The cubic root of 228030813 is about 610.9389936795.

Subtracting 228030813 from its reverse (318030822), we obtain a palindrome (90000009).

The spelling of 228030813 in words is "two hundred twenty-eight million, thirty thousand, eight hundred thirteen".