228428 has 6 divisors (see below), whose sum is σ = 399756. Its totient is φ = 114212.

The previous prime is 228427. The next prime is 228443. The reversal of 228428 is 824822.

228428 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 228397 and 228406.

It is not an unprimeable number, because it can be changed into a prime (228421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28550 + ... + 28557.

It is an arithmetic number, because the mean of its divisors is an integer number (66626).

2²²⁸⁴²⁸ is an apocalyptic number.

It is an amenable number.

228428 is a deficient number, since it is larger than the sum of its proper divisors (171328).

228428 is a wasteful number, since it uses less digits than its factorization.

228428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57111 (or 57109 counting only the distinct ones).

The product of its digits is 2048, while the sum is 26.

The square root of 228428 is about 477.9414190045. The cubic root of 228428 is about 61.1293501726.

It can be divided in two parts, 228 and 428, that added together give a palindrome (656).

The spelling of 228428 in words is "two hundred twenty-eight thousand, four hundred twenty-eight".