228621609 has 20 divisors (see below), whose sum is σ = 341928576. Its totient is φ = 152232696.

The previous prime is 228621571. The next prime is 228621629. The reversal of 228621609 is 906126822.

It is a happy number.

228621609 is a `hidden beast` number, since 2 + 28 + 6 + 21 + 609 = 666.

228621609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 228621609 - 2¹⁹ = 228097321 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (228621629) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 127332 + ... + 129114.

Almost surely, 2^228621609 is an apocalyptic number.

It is an amenable number.

228621609 is a deficient number, since it is larger than the sum of its proper divisors (113306967).

228621609 is a wasteful number, since it uses less digits than its factorization.

228621609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3378 (or 3369 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 228621609 is about 15120.2383909778. The cubic root of 228621609 is about 611.4661578838.

The spelling of 228621609 in words is "two hundred twenty-eight million, six hundred twenty-one thousand, six hundred nine".