28961903 has 8 divisors (see below), whose sum is σ = 29673216. Its totient is φ = 28256800.

The previous prime is 28961887. The next prime is 28961929. The reversal of 28961903 is 30916982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28961903 - 2⁴ = 28961887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28961963) 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 7 ways as a sum of consecutive naturals, for example, 8693 + ... + 11553.

It is an arithmetic number, because the mean of its divisors is an integer number (3709152).

Almost surely, 2^28961903 is an apocalyptic number.

28961903 is a deficient number, since it is larger than the sum of its proper divisors (711313).

28961903 is a wasteful number, since it uses less digits than its factorization.

28961903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3105.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 28961903 is about 5381.6264270200. The cubic root of 28961903 is about 307.0970879185.

The spelling of 28961903 in words is "twenty-eight million, nine hundred sixty-one thousand, nine hundred three".