28240866 has 32 divisors (see below), whose sum is σ = 63141120. Its totient is φ = 9356112.

The previous prime is 28240837. The next prime is 28240909. The reversal of 28240866 is 66804282.

It is a self number, because there is not a number n which added to its sum of digits gives 28240866.

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, 7831 + ... + 10853.

It is an arithmetic number, because the mean of its divisors is an integer number (1973160).

Almost surely, 2^28240866 is an apocalyptic number.

28240866 is an abundant number, since it is smaller than the sum of its proper divisors (34900254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28240866 is a wasteful number, since it uses less digits than its factorization.

28240866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3207 (or 3201 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 28240866 is about 5314.2135824598. The cubic root of 28240866 is about 304.5271397101.

The spelling of 28240866 in words is "twenty-eight million, two hundred forty thousand, eight hundred sixty-six".