28775907 has 6 divisors (see below), whose sum is σ = 41565212. Its totient is φ = 19183932.

The previous prime is 28775867. The next prime is 28775909. The reversal of 28775907 is 70957782.

It is not a de Polignac number, because 28775907 - 2⁷ = 28775779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28775909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1598653 + ... + 1598670.

Almost surely, 2^28775907 is an apocalyptic number.

28775907 is a deficient number, since it is larger than the sum of its proper divisors (12789305).

28775907 is a wasteful number, since it uses less digits than its factorization.

28775907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3197329 (or 3197326 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The square root of 28775907 is about 5364.3179435973. The cubic root of 28775907 is about 306.4382736799.

The spelling of 28775907 in words is "twenty-eight million, seven hundred seventy-five thousand, nine hundred seven".