228905869 has 4 divisors (see below), whose sum is σ = 230442300. Its totient is φ = 227369440.

The previous prime is 228905857. The next prime is 228905893. The reversal of 228905869 is 968509822.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10989225 + 217916644 = 3315^2 + 14762^2 .

It is a cyclic number.

It is not a de Polignac number, because 228905869 - 2¹⁵ = 228873101 is a prime.

It is a super-2 number, since 2×228905869² = 104795793725290322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228905069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 767992 + ... + 768289.

It is an arithmetic number, because the mean of its divisors is an integer number (57610575).

Almost surely, 2^228905869 is an apocalyptic number.

It is an amenable number.

228905869 is a deficient number, since it is larger than the sum of its proper divisors (1536431).

228905869 is a wasteful number, since it uses less digits than its factorization.

228905869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536430.

The product of its (nonzero) digits is 622080, while the sum is 49.

The square root of 228905869 is about 15129.6354549606. The cubic root of 228905869 is about 611.7194780342.

The spelling of 228905869 in words is "two hundred twenty-eight million, nine hundred five thousand, eight hundred sixty-nine".