228208520 has 16 divisors (see below), whose sum is σ = 513469260. Its totient is φ = 91283392.

The previous prime is 228208517. The next prime is 228208559. The reversal of 228208520 is 25802822.

228208520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 211935364 + 16273156 = 14558^2 + 4034^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2852567 + ... + 2852646.

Almost surely, 2^228208520 is an apocalyptic number.

228208520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228208520 is an abundant number, since it is smaller than the sum of its proper divisors (285260740).

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

228208520 is a wasteful number, since it uses less digits than its factorization.

228208520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5705224 (or 5705220 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 29.

The square root of 228208520 is about 15106.5720797274. The cubic root of 228208520 is about 611.0976563674.

The spelling of 228208520 in words is "two hundred twenty-eight million, two hundred eight thousand, five hundred twenty".