228538566 has 48 divisors (see below), whose sum is σ = 510400800. Its totient is φ = 73851264.

The previous prime is 228538559. The next prime is 228538579. The reversal of 228538566 is 665835822.

228538566 is a `hidden beast` number, since 2 + 2 + 85 + 3 + 8 + 566 = 666.

It is a super-2 number, since 2×228538566² = 104459752298672712, which contains 22 as substring.

It is a congruent number.

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, 271975 + ... + 272813.

It is an arithmetic number, because the mean of its divisors is an integer number (10633350).

Almost surely, 2^228538566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228538566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255200400).

228538566 is an abundant number, since it is smaller than the sum of its proper divisors (281862234).

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

228538566 is a wasteful number, since it uses less digits than its factorization.

228538566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293 (or 1290 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The square root of 228538566 is about 15117.4920539089. The cubic root of 228538566 is about 611.3921139447.

The spelling of 228538566 in words is "two hundred twenty-eight million, five hundred thirty-eight thousand, five hundred sixty-six".