28727105 has 16 divisors (see below), whose sum is σ = 38409984. Its totient is φ = 20446080.

The previous prime is 28727087. The next prime is 28727117. The reversal of 28727105 is 50172782.

It is a de Polignac number, because none of the positive numbers 2^k-28727105 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 2972 + ... + 8141.

It is an arithmetic number, because the mean of its divisors is an integer number (2400624).

Almost surely, 2^28727105 is an apocalyptic number.

It is an amenable number.

28727105 is a deficient number, since it is larger than the sum of its proper divisors (9682879).

28727105 is a wasteful number, since it uses less digits than its factorization.

28727105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11176.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 28727105 is about 5359.7672524094. The cubic root of 28727105 is about 306.2649427667.

Adding to 28727105 its reverse (50172782), we get a palindrome (78899887).

The spelling of 28727105 in words is "twenty-eight million, seven hundred twenty-seven thousand, one hundred five".