228635811 has 16 divisors (see below), whose sum is σ = 339887520. Its totient is φ = 151898400.

The previous prime is 228635809. The next prime is 228635831. The reversal of 228635811 is 118536822.

It is a happy number.

228635811 is a `hidden beast` number, since 2 + 2 + 8 + 635 + 8 + 11 = 666.

It is not a de Polignac number, because 228635811 - 2¹ = 228635809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (228635831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6540 + ... + 22361.

It is an arithmetic number, because the mean of its divisors is an integer number (21242970).

Almost surely, 2^228635811 is an apocalyptic number.

228635811 is a deficient number, since it is larger than the sum of its proper divisors (111251709).

228635811 is a wasteful number, since it uses less digits than its factorization.

228635811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29203 (or 29197 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 228635811 is about 15120.7080191372. The cubic root of 228635811 is about 611.4788190704.

The spelling of 228635811 in words is "two hundred twenty-eight million, six hundred thirty-five thousand, eight hundred eleven".