228784865 has 4 divisors (see below), whose sum is σ = 274541844. Its totient is φ = 183027888.

The previous prime is 228784859. The next prime is 228784873. The reversal of 228784865 is 568487822.

It is a happy number.

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 75916369 + 152868496 = 8713^2 + 12364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228784865 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22878482 + ... + 22878491.

It is an arithmetic number, because the mean of its divisors is an integer number (68635461).

Almost surely, 2^228784865 is an apocalyptic number.

It is an amenable number.

228784865 is a deficient number, since it is larger than the sum of its proper divisors (45756979).

228784865 is an equidigital number, since it uses as much as digits as its factorization.

228784865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45756978.

The product of its digits is 1720320, while the sum is 50.

The square root of 228784865 is about 15125.6360196853. The cubic root of 228784865 is about 611.6116701818.

The spelling of 228784865 in words is "two hundred twenty-eight million, seven hundred eighty-four thousand, eight hundred sixty-five".