228081565 has 16 divisors (see below), whose sum is σ = 284232816. Its totient is φ = 175564800.

The previous prime is 228081559. The next prime is 228081583. The reversal of 228081565 is 565180822.

It can be written as a sum of positive squares in 8 ways, for example, as 6041764 + 222039801 = 2458^2 + 14901^2 .

It is not a de Polignac number, because 228081565 - 2⁷ = 228081437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7345 + ... + 22585.

It is an arithmetic number, because the mean of its divisors is an integer number (17764551).

Almost surely, 2^228081565 is an apocalyptic number.

It is an amenable number.

228081565 is a deficient number, since it is larger than the sum of its proper divisors (56151251).

228081565 is a wasteful number, since it uses less digits than its factorization.

228081565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15360.

The product of its (nonzero) digits is 38400, while the sum is 37.

The square root of 228081565 is about 15102.3695160726. The cubic root of 228081565 is about 610.9843151506.

It can be divided in two parts, 2280 and 81565, that added together give a triangular number (83845 = T₄₀₉).

The spelling of 228081565 in words is "two hundred twenty-eight million, eighty-one thousand, five hundred sixty-five".