228245665 has 4 divisors (see below), whose sum is σ = 273894804. Its totient is φ = 182596528.

The previous prime is 228245639. The next prime is 228245671. The reversal of 228245665 is 566542822.

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 166513216 + 61732449 = 12904^2 + 7857^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228245665 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 22824562 + ... + 22824571.

It is an arithmetic number, because the mean of its divisors is an integer number (68473701).

Almost surely, 2^228245665 is an apocalyptic number.

It is an amenable number.

228245665 is a deficient number, since it is larger than the sum of its proper divisors (45649139).

228245665 is an equidigital number, since it uses as much as digits as its factorization.

228245665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45649138.

The product of its digits is 230400, while the sum is 40.

The square root of 228245665 is about 15107.8014614966. The cubic root of 228245665 is about 611.1308102435.

The spelling of 228245665 in words is "two hundred twenty-eight million, two hundred forty-five thousand, six hundred sixty-five".