228851809 has 8 divisors (see below), whose sum is σ = 235007528. Its totient is φ = 222773760.

The previous prime is 228851801. The next prime is 228851813. The reversal of 228851809 is 908158822.

It can be written as a sum of positive squares in 4 ways, for example, as 12673600 + 216178209 = 3560^2 + 14703^2 .

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 228851809 - 2³ = 228851801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228851801) 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, 13422 + ... + 25255.

It is an arithmetic number, because the mean of its divisors is an integer number (29375941).

Almost surely, 2^228851809 is an apocalyptic number.

It is an amenable number.

228851809 is a deficient number, since it is larger than the sum of its proper divisors (6155719).

228851809 is an equidigital number, since it uses as much as digits as its factorization.

228851809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38835.

The product of its (nonzero) digits is 92160, while the sum is 43.

The square root of 228851809 is about 15127.8487895669. The cubic root of 228851809 is about 611.6713182691.

The spelling of 228851809 in words is "two hundred twenty-eight million, eight hundred fifty-one thousand, eight hundred nine".