28101689 has 16 divisors (see below), whose sum is σ = 35266560. Its totient is φ = 21753360.

The previous prime is 28101683. The next prime is 28101691. The reversal of 28101689 is 98610182.

It is a cyclic number.

It is not a de Polignac number, because 28101689 - 2⁴ = 28101673 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28101683) 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 in 15 ways as a sum of consecutive naturals, for example, 11432 + ... + 13670.

It is an arithmetic number, because the mean of its divisors is an integer number (2204160).

Almost surely, 2^28101689 is an apocalyptic number.

It is an amenable number.

28101689 is a deficient number, since it is larger than the sum of its proper divisors (7164871).

28101689 is a wasteful number, since it uses less digits than its factorization.

28101689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2420.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 28101689 is about 5301.1026211535. The cubic root of 28101689 is about 304.0260574675.

The spelling of 28101689 in words is "twenty-eight million, one hundred one thousand, six hundred eighty-nine".