228537685 has 4 divisors (see below), whose sum is σ = 274245228. Its totient is φ = 182830144.

The previous prime is 228537679. The next prime is 228537689. The reversal of 228537685 is 586735822.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 75916369 + 152621316 = 8713^2 + 12354^2 .

It is a cyclic number.

It is not a de Polignac number, because 228537685 - 2³ = 228537677 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 (228537689) 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, 22853764 + ... + 22853773.

It is an arithmetic number, because the mean of its divisors is an integer number (68561307).

Almost surely, 2^228537685 is an apocalyptic number.

It is an amenable number.

228537685 is a deficient number, since it is larger than the sum of its proper divisors (45707543).

228537685 is an equidigital number, since it uses as much as digits as its factorization.

228537685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45707542.

The product of its digits is 806400, while the sum is 46.

The square root of 228537685 is about 15117.4629154498. The cubic root of 228537685 is about 611.3913283192.

The spelling of 228537685 in words is "two hundred twenty-eight million, five hundred thirty-seven thousand, six hundred eighty-five".