28066857 has 48 divisors (see below), whose sum is σ = 49412160. Its totient is φ = 14007168.

The previous prime is 28066793. The next prime is 28066879. The reversal of 28066857 is 75866082.

It is not a de Polignac number, because 28066857 - 2⁶ = 28066793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28066457) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35923 + ... + 36695.

It is an arithmetic number, because the mean of its divisors is an integer number (1029420).

Almost surely, 2^28066857 is an apocalyptic number.

It is an amenable number.

28066857 is a deficient number, since it is larger than the sum of its proper divisors (21345303).

28066857 is a wasteful number, since it uses less digits than its factorization.

28066857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822 (or 815 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 28066857 is about 5297.8162482291. The cubic root of 28066857 is about 303.9003922567.

The spelling of 28066857 in words is "twenty-eight million, sixty-six thousand, eight hundred fifty-seven".