228764919 has 4 divisors (see below), whose sum is σ = 305019896. Its totient is φ = 152509944.

The previous prime is 228764917. The next prime is 228764927. The reversal of 228764919 is 919467822.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 228764919 - 2¹ = 228764917 is a prime.

It is a super-2 number, since 2×228764919² = 104666776330153122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228764917) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 38127484 + ... + 38127489.

It is an arithmetic number, because the mean of its divisors is an integer number (76254974).

Almost surely, 2^228764919 is an apocalyptic number.

228764919 is a deficient number, since it is larger than the sum of its proper divisors (76254977).

228764919 is an equidigital number, since it uses as much as digits as its factorization.

228764919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76254976.

The product of its digits is 435456, while the sum is 48.

The square root of 228764919 is about 15124.9766611390. The cubic root of 228764919 is about 611.5938957529.

The spelling of 228764919 in words is "two hundred twenty-eight million, seven hundred sixty-four thousand, nine hundred nineteen".