228665823 has 8 divisors (see below), whose sum is σ = 305215536. Its totient is φ = 152280000.

The previous prime is 228665813. The next prime is 228665837. The reversal of 228665823 is 328566822.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 228665823 - 2⁵ = 228665791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228665803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37678 + ... + 43323.

It is an arithmetic number, because the mean of its divisors is an integer number (38151942).

Almost surely, 2^228665823 is an apocalyptic number.

228665823 is a deficient number, since it is larger than the sum of its proper divisors (76549713).

228665823 is an equidigital number, since it uses as much as digits as its factorization.

228665823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81945.

The product of its digits is 276480, while the sum is 42.

The square root of 228665823 is about 15121.7004004179. The cubic root of 228665823 is about 611.5055732627.

Subtracting 228665823 from its reverse (328566822), we obtain a palindrome (99900999).

The spelling of 228665823 in words is "two hundred twenty-eight million, six hundred sixty-five thousand, eight hundred twenty-three".