228638 has 4 divisors (see below), whose sum is σ = 342960. Its totient is φ = 114318.

The previous prime is 228637. The next prime is 228647. The reversal of 228638 is 836822.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 228638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57158 + ... + 57161.

It is an arithmetic number, because the mean of its divisors is an integer number (85740).

2²²⁸⁶³⁸ is an apocalyptic number.

228638 is a deficient number, since it is larger than the sum of its proper divisors (114322).

228638 is a wasteful number, since it uses less digits than its factorization.

228638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114321.

The product of its digits is 4608, while the sum is 29.

The square root of 228638 is about 478.1610607316. The cubic root of 228638 is about 61.1480770533.

It can be divided in two parts, 2286 and 38, that multiplied together give a palindrome (86868).

The spelling of 228638 in words is "two hundred twenty-eight thousand, six hundred thirty-eight".