28129803 has 32 divisors (see below), whose sum is σ = 42577920. Its totient is φ = 16398720.

The previous prime is 28129789. The next prime is 28129807. The reversal of 28129803 is 30892182.

It is not a de Polignac number, because 28129803 - 2⁵ = 28129771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28129807) 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 31 ways as a sum of consecutive naturals, for example, 63858 + ... + 64296.

It is an arithmetic number, because the mean of its divisors is an integer number (1330560).

Almost surely, 2^28129803 is an apocalyptic number.

28129803 is a deficient number, since it is larger than the sum of its proper divisors (14448117).

28129803 is a wasteful number, since it uses less digits than its factorization.

28129803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 28129803 is about 5303.7536707506. The cubic root of 28129803 is about 304.1274100918.

The spelling of 28129803 in words is "twenty-eight million, one hundred twenty-nine thousand, eight hundred three".