228388809 has 16 divisors (see below), whose sum is σ = 332879040. Its totient is φ = 138135360.

The previous prime is 228388793. The next prime is 228388813. The reversal of 228388809 is 908883822.

It is not a de Polignac number, because 228388809 - 2⁴ = 228388793 is a prime.

It is a super-2 number, since 2×228388809² = 104322896152876962, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (228388879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9999 + ... + 23595.

It is an arithmetic number, because the mean of its divisors is an integer number (20804940).

Almost surely, 2^228388809 is an apocalyptic number.

It is an amenable number.

228388809 is a deficient number, since it is larger than the sum of its proper divisors (104490231).

228388809 is a wasteful number, since it uses less digits than its factorization.

228388809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14120.

The product of its (nonzero) digits is 442368, while the sum is 48.

The square root of 228388809 is about 15112.5381389097. The cubic root of 228388809 is about 611.2585402013.

The spelling of 228388809 in words is "two hundred twenty-eight million, three hundred eighty-eight thousand, eight hundred nine".