28203901 has 16 divisors (see below), whose sum is σ = 33281280. Its totient is φ = 23610880.

The previous prime is 28203883. The next prime is 28203919. The reversal of 28203901 is 10930282.

It is an interprime number because it is at equal distance from previous prime (28203883) and next prime (28203919).

It is a cyclic number.

It is not a de Polignac number, because 28203901 - 2⁹ = 28203389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28203971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7185 + ... + 10393.

It is an arithmetic number, because the mean of its divisors is an integer number (2080080).

Almost surely, 2^28203901 is an apocalyptic number.

It is an amenable number.

28203901 is a deficient number, since it is larger than the sum of its proper divisors (5077379).

28203901 is a wasteful number, since it uses less digits than its factorization.

28203901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3284.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 28203901 is about 5310.7345066384. The cubic root of 28203901 is about 304.3942145993.

The spelling of 28203901 in words is "twenty-eight million, two hundred three thousand, nine hundred one".