28133105 has 72 divisors (see below), whose sum is σ = 47123496. Its totient is φ = 15966720.

The previous prime is 28133101. The next prime is 28133141. The reversal of 28133105 is 50133182.

It can be written as a sum of positive squares in 4 ways, for example, as 717409 + 27415696 = 847^2 + 5236^2 .

It is not a de Polignac number, because 28133105 - 2² = 28133101 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28133101) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 385349 + ... + 385421.

It is an arithmetic number, because the mean of its divisors is an integer number (654493).

Almost surely, 2^28133105 is an apocalyptic number.

It is an amenable number.

28133105 is a deficient number, since it is larger than the sum of its proper divisors (18990391).

28133105 is a wasteful number, since it uses less digits than its factorization.

28133105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 28133105 is about 5304.0649505827. The cubic root of 28133105 is about 304.1393095639.

Adding to 28133105 its reverse (50133182), we get a palindrome (78266287).

The spelling of 28133105 in words is "twenty-eight million, one hundred thirty-three thousand, one hundred five".