229042728 has 160 divisors (see below), whose sum is σ = 677837160. Its totient is φ = 72161280.

The previous prime is 229042633. The next prime is 229042729. The reversal of 229042728 is 827240922.

It is a happy number.

229042728 is a `hidden beast` number, since 229 + 0 + 427 + 2 + 8 = 666.

229042728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 154703844 + 74338884 = 12438^2 + 8622^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 229042692 and 229042701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (229042729) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 982900 + ... + 983132.

Almost surely, 2^229042728 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 229042728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (338918580).

229042728 is an abundant number, since it is smaller than the sum of its proper divisors (448794432).

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

229042728 is a wasteful number, since it uses less digits than its factorization.

229042728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329 (or 316 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 229042728 is about 15134.1576574317. The cubic root of 229042728 is about 611.8413660358.

The spelling of 229042728 in words is "two hundred twenty-nine million, forty-two thousand, seven hundred twenty-eight".