28131104 has 12 divisors (see below), whose sum is σ = 55383174. Its totient is φ = 14065536.

The previous prime is 28131091. The next prime is 28131109. The reversal of 28131104 is 40113182.

It can be written as a sum of positive squares in only one way, i.e., 27583504 + 547600 = 5252^2 + 740^2 .

It is not an unprimeable number, because it can be changed into a prime (28131109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439517 + ... + 439580.

Almost surely, 2^28131104 is an apocalyptic number.

It is an amenable number.

28131104 is a deficient number, since it is larger than the sum of its proper divisors (27252070).

28131104 is an equidigital number, since it uses as much as digits as its factorization.

28131104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879107 (or 879099 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 28131104 is about 5303.8763183166. The cubic root of 28131104 is about 304.1320986382.

Adding to 28131104 its reverse (40113182), we get a palindrome (68244286).

The spelling of 28131104 in words is "twenty-eight million, one hundred thirty-one thousand, one hundred four".