228522 has 16 divisors (see below), whose sum is σ = 522432. Its totient is φ = 65280.

The previous prime is 228521. The next prime is 228523. The reversal of 228522 is 225822.

It is an interprime number because it is at equal distance from previous prime (228521) and next prime (228523).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (228521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2679 + ... + 2762.

It is an arithmetic number, because the mean of its divisors is an integer number (32652).

2²²⁸⁵²² is an apocalyptic number.

228522 is an abundant number, since it is smaller than the sum of its proper divisors (293910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

228522 is a wasteful number, since it uses less digits than its factorization.

228522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5453.

The product of its digits is 640, while the sum is 21.

The square root of 228522 is about 478.0397473014. The cubic root of 228522 is about 61.1377340995.

The spelling of 228522 in words is "two hundred twenty-eight thousand, five hundred twenty-two".