228783 has 4 divisors (see below), whose sum is σ = 305048. Its totient is φ = 152520.

The previous prime is 228773. The next prime is 228793. The reversal of 228783 is 387822.

Added to its reverse (387822) it gives a triangular number (616605 = T₁₁₁₀).

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

It is an interprime number because it is at equal distance from previous prime (228773) and next prime (228793).

It is not a de Polignac number, because 228783 - 2⁵ = 228751 is a prime.

It is a super-2 number, since 2×228783² = 104683322178, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

228783 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 228783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228713) 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, 38128 + ... + 38133.

It is an arithmetic number, because the mean of its divisors is an integer number (76262).

2²²⁸⁷⁸³ is an apocalyptic number.

228783 is a deficient number, since it is larger than the sum of its proper divisors (76265).

228783 is an equidigital number, since it uses as much as digits as its factorization.

228783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76264.

The product of its digits is 5376, while the sum is 30.

The square root of 228783 is about 478.3126592512. The cubic root of 228783 is about 61.1610008273.

Adding to 228783 its reverse (387822), we get a triangular number (616605 = T₁₁₁₀).

The spelling of 228783 in words is "two hundred twenty-eight thousand, seven hundred eighty-three".