228816666 has 24 divisors (see below), whose sum is σ = 533906100. Its totient is φ = 70405056.

The previous prime is 228816661. The next prime is 228816697. The reversal of 228816666 is 666618822.

It can be written as a sum of positive squares in 2 ways, for example, as 225630441 + 3186225 = 15021^2 + 1785^2 .

It is not an unprimeable number, because it can be changed into a prime (228816661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 488691 + ... + 489158.

Almost surely, 2^228816666 is an apocalyptic number.

228816666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

228816666 is an abundant number, since it is smaller than the sum of its proper divisors (305089434).

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

228816666 is a wasteful number, since it uses less digits than its factorization.

228816666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977870 (or 977867 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 228816666 is about 15126.6872116799. The cubic root of 228816666 is about 611.6400067905.

The spelling of 228816666 in words is "two hundred twenty-eight million, eight hundred sixteen thousand, six hundred sixty-six".