229312728 has 128 divisors (see below), whose sum is σ = 680011200. Its totient is φ = 71350272.

The previous prime is 229312709. The next prime is 229312739. The reversal of 229312728 is 827213922.

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 = 229312692 and 229312701.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 723226 + ... + 723542.

Almost surely, 2^229312728 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 229312728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (340005600).

229312728 is an abundant number, since it is smaller than the sum of its proper divisors (450698472).

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

229312728 is a wasteful number, since it uses less digits than its factorization.

229312728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546 (or 536 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 229312728 is about 15143.0752491031. The cubic root of 229312728 is about 612.0816884423.

The spelling of 229312728 in words is "two hundred twenty-nine million, three hundred twelve thousand, seven hundred twenty-eight".