28785385 has 16 divisors (see below), whose sum is σ = 35479296. Its totient is φ = 22409728.

The previous prime is 28785373. The next prime is 28785401. The reversal of 28785385 is 58358782.

It is a cyclic number.

It is not a de Polignac number, because 28785385 - 2⁷ = 28785257 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81369 + ... + 81721.

It is an arithmetic number, because the mean of its divisors is an integer number (2217456).

Almost surely, 2^28785385 is an apocalyptic number.

It is an amenable number.

28785385 is a deficient number, since it is larger than the sum of its proper divisors (6693911).

28785385 is a wasteful number, since it uses less digits than its factorization.

28785385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752.

The product of its digits is 537600, while the sum is 46.

The square root of 28785385 is about 5365.2013009765. The cubic root of 28785385 is about 306.4719141271.

The spelling of 28785385 in words is "twenty-eight million, seven hundred eighty-five thousand, three hundred eighty-five".