228731140 has 72 divisors (see below), whose sum is σ = 539473536. Its totient is φ = 81364800.

The previous prime is 228731137. The next prime is 228731171. The reversal of 228731140 is 41137822.

228731140 = 2183² + 2184² + ... + 2229².

228731140 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 228731099 and 228731108.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 112735 + ... + 114745.

It is an arithmetic number, because the mean of its divisors is an integer number (7492688).

Almost surely, 2^228731140 is an apocalyptic number.

228731140 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 228731140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269736768).

228731140 is an abundant number, since it is smaller than the sum of its proper divisors (310742396).

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

228731140 is a wasteful number, since it uses less digits than its factorization.

228731140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2089 (or 2076 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 228731140 is about 15123.8599570348. The cubic root of 228731140 is about 611.5637920010.

Adding to 228731140 its reverse (41137822), we get a palindrome (269868962).

The spelling of 228731140 in words is "two hundred twenty-eight million, seven hundred thirty-one thousand, one hundred forty".