28280685 has 16 divisors (see below), whose sum is σ = 47217024. Its totient is φ = 14427072.

The previous prime is 28280669. The next prime is 28280687. The reversal of 28280685 is 58608282.

It is not a de Polignac number, because 28280685 - 2⁴ = 28280669 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28280687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40642 + ... + 41331.

It is an arithmetic number, because the mean of its divisors is an integer number (2951064).

Almost surely, 2^28280685 is an apocalyptic number.

It is an amenable number.

28280685 is a deficient number, since it is larger than the sum of its proper divisors (18936339).

28280685 is a wasteful number, since it uses less digits than its factorization.

28280685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82004.

The product of its (nonzero) digits is 61440, while the sum is 39.

The square root of 28280685 is about 5317.9587249244. The cubic root of 28280685 is about 304.6701980182.

The spelling of 28280685 in words is "twenty-eight million, two hundred eighty thousand, six hundred eighty-five".