228721134 has 16 divisors (see below), whose sum is σ = 457591680. Its totient is φ = 76215480.

The previous prime is 228721133. The next prime is 228721139. The reversal of 228721134 is 431127822.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228721133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29077 + ... + 36095.

It is an arithmetic number, because the mean of its divisors is an integer number (28599480).

Almost surely, 2^228721134 is an apocalyptic number.

228721134 is an abundant number, since it is smaller than the sum of its proper divisors (228870546).

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

228721134 is a wasteful number, since it uses less digits than its factorization.

228721134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12455.

The product of its digits is 5376, while the sum is 30.

The square root of 228721134 is about 15123.5291516233. The cubic root of 228721134 is about 611.5548741123.

Adding to 228721134 its reverse (431127822), we get a palindrome (659848956).

The spelling of 228721134 in words is "two hundred twenty-eight million, seven hundred twenty-one thousand, one hundred thirty-four".