228235709 has 8 divisors (see below), whose sum is σ = 249822552. Its totient is φ = 207224640.

The previous prime is 228235703. The next prime is 228235717. The reversal of 228235709 is 907532822.

It can be written as a sum of positive squares in 4 ways, for example, as 2184484 + 226051225 = 1478^2 + 15035^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228235709 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 (228235703) 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 7 ways as a sum of consecutive naturals, for example, 143114 + ... + 144699.

It is an arithmetic number, because the mean of its divisors is an integer number (31227819).

Almost surely, 2^228235709 is an apocalyptic number.

It is an amenable number.

228235709 is a deficient number, since it is larger than the sum of its proper divisors (21586843).

228235709 is a wasteful number, since it uses less digits than its factorization.

228235709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287887.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 228235709 is about 15107.4719592657. The cubic root of 228235709 is about 611.1219243400.

The spelling of 228235709 in words is "two hundred twenty-eight million, two hundred thirty-five thousand, seven hundred nine".