28257685 has 8 divisors (see below), whose sum is σ = 35383680. Its totient is φ = 21623184.

The previous prime is 28257659. The next prime is 28257707. The reversal of 28257685 is 58675282.

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 28257685 - 2⁷ = 28257557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122745 + ... + 122974.

It is an arithmetic number, because the mean of its divisors is an integer number (4422960).

Almost surely, 2^28257685 is an apocalyptic number.

It is an amenable number.

28257685 is a deficient number, since it is larger than the sum of its proper divisors (7125995).

28257685 is a wasteful number, since it uses less digits than its factorization.

28257685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245747.

The product of its digits is 268800, while the sum is 43.

The square root of 28257685 is about 5315.7958011948. The cubic root of 28257685 is about 304.5875819728.

The spelling of 28257685 in words is "twenty-eight million, two hundred fifty-seven thousand, six hundred eighty-five".