228521012 has 12 divisors (see below), whose sum is σ = 401060100. Its totient is φ = 113932416.

The previous prime is 228520997. The next prime is 228521017. The reversal of 228521012 is 210125822.

It can be written as a sum of positive squares in 2 ways, for example, as 169937296 + 58583716 = 13036^2 + 7654^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228521017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80453 + ... + 83244.

It is an arithmetic number, because the mean of its divisors is an integer number (33421675).

Almost surely, 2^228521012 is an apocalyptic number.

It is an amenable number.

228521012 is a deficient number, since it is larger than the sum of its proper divisors (172539088).

228521012 is a wasteful number, since it uses less digits than its factorization.

228521012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164050 (or 164048 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 228521012 is about 15116.9114570404. The cubic root of 228521012 is about 611.3764599099.

Adding to 228521012 its reverse (210125822), we get a palindrome (438646834).

The spelling of 228521012 in words is "two hundred twenty-eight million, five hundred twenty-one thousand, twelve".