228729688 has 32 divisors (see below), whose sum is σ = 471744720. Its totient is φ = 103963200.

The previous prime is 228729649. The next prime is 228729707. The reversal of 228729688 is 886927822.

228729688 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93 + ... + 21388.

Almost surely, 2^228729688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228729688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235872360).

228729688 is an abundant number, since it is smaller than the sum of its proper divisors (243015032).

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

228729688 is a wasteful number, since it uses less digits than its factorization.

228729688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21520 (or 21494 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 52.

The square root of 228729688 is about 15123.8119533403. The cubic root of 228729688 is about 611.5624979161.

The spelling of 228729688 in words is "two hundred twenty-eight million, seven hundred twenty-nine thousand, six hundred eighty-eight".