28875905 has 8 divisors (see below), whose sum is σ = 34775232. Its totient is φ = 23017968.

The previous prime is 28875893. The next prime is 28875929. The reversal of 28875905 is 50957882.

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 28875905 - 2¹² = 28871809 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8789 + ... + 11618.

It is an arithmetic number, because the mean of its divisors is an integer number (4346904).

Almost surely, 2^28875905 is an apocalyptic number.

It is an amenable number.

28875905 is a deficient number, since it is larger than the sum of its proper divisors (5899327).

28875905 is a wasteful number, since it uses less digits than its factorization.

28875905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20695.

The product of its (nonzero) digits is 201600, while the sum is 44.

The square root of 28875905 is about 5373.6305232124. The cubic root of 28875905 is about 306.7928270822.

The spelling of 28875905 in words is "twenty-eight million, eight hundred seventy-five thousand, nine hundred five".