28645903 has 12 divisors (see below), whose sum is σ = 33910744. Its totient is φ = 24037200.

The previous prime is 28645861. The next prime is 28645909. The reversal of 28645903 is 30954682.

It is not a de Polignac number, because 28645903 - 2²¹ = 26548751 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 (28645909) 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 11 ways as a sum of consecutive naturals, for example, 7533 + ... + 10678.

Almost surely, 2^28645903 is an apocalyptic number.

28645903 is a deficient number, since it is larger than the sum of its proper divisors (5264841).

28645903 is a wasteful number, since it uses less digits than its factorization.

28645903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18246 (or 18235 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 28645903 is about 5352.1867493577. The cubic root of 28645903 is about 305.9761006296.

The spelling of 28645903 in words is "twenty-eight million, six hundred forty-five thousand, nine hundred three".