228609999 has 16 divisors (see below), whose sum is σ = 358604640. Its totient is φ = 143441280.

The previous prime is 228609967. The next prime is 228610009. The reversal of 228609999 is 999906822.

228609999 is a `hidden beast` number, since 2 + 28 + 609 + 9 + 9 + 9 = 666.

It is not a de Polignac number, because 228609999 - 2⁵ = 228609967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228609959) 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, 248572 + ... + 249489.

It is an arithmetic number, because the mean of its divisors is an integer number (22412790).

Almost surely, 2^228609999 is an apocalyptic number.

228609999 is a deficient number, since it is larger than the sum of its proper divisors (129994641).

228609999 is a wasteful number, since it uses less digits than its factorization.

228609999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498087 (or 498081 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The square root of 228609999 is about 15119.8544635853. The cubic root of 228609999 is about 611.4558070945.

The spelling of 228609999 in words is "two hundred twenty-eight million, six hundred nine thousand, nine hundred ninety-nine".