228815 has 4 divisors (see below), whose sum is σ = 274584. Its totient is φ = 183048.

The previous prime is 228799. The next prime is 228829. The reversal of 228815 is 518822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 518822 = 2 ⋅259411.

It is a cyclic number.

It is not a de Polignac number, because 228815 - 2⁴ = 228799 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

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, 22877 + ... + 22886.

It is an arithmetic number, because the mean of its divisors is an integer number (68646).

2²²⁸⁸¹⁵ is an apocalyptic number.

228815 is a deficient number, since it is larger than the sum of its proper divisors (45769).

228815 is an equidigital number, since it uses as much as digits as its factorization.

228815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45768.

The product of its digits is 1280, while the sum is 26.

The square root of 228815 is about 478.3461090048. The cubic root of 228815 is about 61.1638522349.

It can be divided in two parts, 2 and 28815, that multiplied together give a triangular number (57630 = T₃₃₉).

The spelling of 228815 in words is "two hundred twenty-eight thousand, eight hundred fifteen".