228788660 has 12 divisors (see below), whose sum is σ = 480456228. Its totient is φ = 91515456.

The previous prime is 228788653. The next prime is 228788663. The reversal of 228788660 is 66887822.

It can be written as a sum of positive squares in 2 ways, for example, as 69322276 + 159466384 = 8326^2 + 12628^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228788663) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5719697 + ... + 5719736.

It is an arithmetic number, because the mean of its divisors is an integer number (40038019).

Almost surely, 2^228788660 is an apocalyptic number.

228788660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228788660 is an abundant number, since it is smaller than the sum of its proper divisors (251667568).

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

228788660 is a wasteful number, since it uses less digits than its factorization.

228788660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11439442 (or 11439440 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 47.

The square root of 228788660 is about 15125.7614684352. The cubic root of 228788660 is about 611.6150518936.

The spelling of 228788660 in words is "two hundred twenty-eight million, seven hundred eighty-eight thousand, six hundred sixty".