28563907 has 8 divisors (see below), whose sum is σ = 29859840. Its totient is φ = 27272520.

The previous prime is 28563877. The next prime is 28563917. The reversal of 28563907 is 70936582.

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 28563907 - 2⁷ = 28563779 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28563907.

It is not an unprimeable number, because it can be changed into a prime (28563917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21694 + ... + 22972.

It is an arithmetic number, because the mean of its divisors is an integer number (3732480).

Almost surely, 2^28563907 is an apocalyptic number.

28563907 is a deficient number, since it is larger than the sum of its proper divisors (1295933).

28563907 is a wasteful number, since it uses less digits than its factorization.

28563907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2273.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 28563907 is about 5344.5212133549. The cubic root of 28563907 is about 305.6838797542.

The spelling of 28563907 in words is "twenty-eight million, five hundred sixty-three thousand, nine hundred seven".