228628 has 12 divisors (see below), whose sum is σ = 407092. Its totient is φ = 112320.

The previous prime is 228619. The next prime is 228637. The reversal of 228628 is 826822.

It is a happy number.

228628 is nontrivially palindromic in base 3.

It is an interprime number because it is at equal distance from previous prime (228619) and next prime (228637).

It can be written as a sum of positive squares in 2 ways, for example, as 9604 + 219024 = 98^2 + 468^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 228596 and 228605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225 + ... + 712.

2²²⁸⁶²⁸ is an apocalyptic number.

It is an amenable number.

228628 is a deficient number, since it is larger than the sum of its proper divisors (178464).

228628 is a wasteful number, since it uses less digits than its factorization.

228628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002 (or 1000 counting only the distinct ones).

The product of its digits is 3072, while the sum is 28.

The square root of 228628 is about 478.1506038896. The cubic root of 228628 is about 61.1471855572.

The spelling of 228628 in words is "two hundred twenty-eight thousand, six hundred twenty-eight".