228709 has 8 divisors (see below), whose sum is σ = 250712. Its totient is φ = 207360.

The previous prime is 228707. The next prime is 228713. The reversal of 228709 is 907822.

228709 is nontrivially palindromic in base 15.

228709 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 4 ways, for example, as 28900 + 199809 = 170^2 + 447^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 228709 - 2¹ = 228707 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228707) 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, 829 + ... + 1069.

It is an arithmetic number, because the mean of its divisors is an integer number (31339).

2²²⁸⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

228709 is a deficient number, since it is larger than the sum of its proper divisors (22003).

228709 is a wasteful number, since it uses less digits than its factorization.

228709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 228709 is about 478.2352977353. The cubic root of 228709 is about 61.1544059286.

The spelling of 228709 in words is "two hundred twenty-eight thousand, seven hundred nine".