228538639 has 4 divisors (see below), whose sum is σ = 261187024. Its totient is φ = 195890256.

The previous prime is 228538637. The next prime is 228538643. The reversal of 228538639 is 936835822.

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

It is a cyclic number.

It is not a de Polignac number, because 228538639 - 2¹ = 228538637 is a prime.

It is a super-3 number, since 3×228538639³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228538637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16324182 + ... + 16324195.

It is an arithmetic number, because the mean of its divisors is an integer number (65296756).

Almost surely, 2^228538639 is an apocalyptic number.

228538639 is a deficient number, since it is larger than the sum of its proper divisors (32648385).

228538639 is an equidigital number, since it uses as much as digits as its factorization.

228538639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32648384.

The product of its digits is 622080, while the sum is 46.

The square root of 228538639 is about 15117.4944683304. The cubic root of 228538639 is about 611.3921790418.

The spelling of 228538639 in words is "two hundred twenty-eight million, five hundred thirty-eight thousand, six hundred thirty-nine".