228523865 has 4 divisors (see below), whose sum is σ = 274228644. Its totient is φ = 182819088.

The previous prime is 228523861. The next prime is 228523871. The reversal of 228523865 is 568325822.

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 76667536 + 151856329 = 8756^2 + 12323^2 .

It is a cyclic number.

It is not a de Polignac number, because 228523865 - 2² = 228523861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228523861) 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, 22852382 + ... + 22852391.

It is an arithmetic number, because the mean of its divisors is an integer number (68557161).

Almost surely, 2^228523865 is an apocalyptic number.

It is an amenable number.

228523865 is a deficient number, since it is larger than the sum of its proper divisors (45704779).

228523865 is an equidigital number, since it uses as much as digits as its factorization.

228523865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45704778.

The product of its digits is 230400, while the sum is 41.

The square root of 228523865 is about 15117.0058212597. The cubic root of 228523865 is about 611.3790041687.

The spelling of 228523865 in words is "two hundred twenty-eight million, five hundred twenty-three thousand, eight hundred sixty-five".