228608720 has 20 divisors (see below), whose sum is σ = 531515460. Its totient is φ = 91443456.

The previous prime is 228608719. The next prime is 228608729. The reversal of 228608720 is 27806822.

It can be written as a sum of positive squares in 2 ways, for example, as 155950144 + 72658576 = 12488^2 + 8524^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228608729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1428725 + ... + 1428884.

It is an arithmetic number, because the mean of its divisors is an integer number (26575773).

Almost surely, 2^228608720 is an apocalyptic number.

228608720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228608720 is an abundant number, since it is smaller than the sum of its proper divisors (302906740).

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

228608720 is a wasteful number, since it uses less digits than its factorization.

228608720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2857622 (or 2857616 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 228608720 is about 15119.8121681455. The cubic root of 228608720 is about 611.4546667924.

The spelling of 228608720 in words is "two hundred twenty-eight million, six hundred eight thousand, seven hundred twenty".