228728340 has 96 divisors (see below), whose sum is σ = 729025920. Its totient is φ = 59500800.

The previous prime is 228728333. The next prime is 228728341. The reversal of 228728340 is 43827822.

228728340 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 = 228728295 and 228728304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228728341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16975 + ... + 27305.

It is an arithmetic number, because the mean of its divisors is an integer number (7594020).

Almost surely, 2^228728340 is an apocalyptic number.

228728340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228728340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (364512960).

228728340 is an abundant number, since it is smaller than the sum of its proper divisors (500297580).

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

228728340 is a wasteful number, since it uses less digits than its factorization.

228728340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10390 (or 10382 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 228728340 is about 15123.7673877906. The cubic root of 228728340 is about 611.5612965157.

The spelling of 228728340 in words is "two hundred twenty-eight million, seven hundred twenty-eight thousand, three hundred forty".