228505765 has 8 divisors (see below), whose sum is σ = 274288248. Its totient is φ = 182750400.

The previous prime is 228505699. The next prime is 228505777. The reversal of 228505765 is 567505822.

It can be written as a sum of positive squares in 4 ways, for example, as 52519009 + 175986756 = 7247^2 + 13266^2 .

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

It is not a de Polignac number, because 228505765 - 2⁷ = 228505637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27879 + ... + 35131.

It is an arithmetic number, because the mean of its divisors is an integer number (34286031).

Almost surely, 2^228505765 is an apocalyptic number.

It is an amenable number.

228505765 is a deficient number, since it is larger than the sum of its proper divisors (45782483).

228505765 is an equidigital number, since it uses as much as digits as its factorization.

228505765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13559.

The product of its (nonzero) digits is 168000, while the sum is 40.

The square root of 228505765 is about 15116.4071458796. The cubic root of 228505765 is about 611.3628625254.

The spelling of 228505765 in words is "two hundred twenty-eight million, five hundred five thousand, seven hundred sixty-five".