13505228 has 24 divisors (see below), whose sum is σ = 25933824. Its totient is φ = 6102800.

The previous prime is 13505227. The next prime is 13505263. The reversal of 13505228 is 82250531.

It is a junction number, because it is equal to n+sod(n) for n = 13505197 and 13505206.

It is not an unprimeable number, because it can be changed into a prime (13505227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7601 + ... + 9207.

It is an arithmetic number, because the mean of its divisors is an integer number (1080576).

Almost surely, 2^13505228 is an apocalyptic number.

It is an amenable number.

13505228 is a deficient number, since it is larger than the sum of its proper divisors (12428596).

13505228 is a wasteful number, since it uses less digits than its factorization.

13505228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1813 (or 1811 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 13505228 is about 3674.9459859976. The cubic root of 13505228 is about 238.1408906162.

Adding to 13505228 its reverse (82250531), we get a palindrome (95755759).

The spelling of 13505228 in words is "thirteen million, five hundred five thousand, two hundred twenty-eight".