28021850 has 12 divisors (see below), whose sum is σ = 52120734. Its totient is φ = 11208720.

The previous prime is 28021841. The next prime is 28021883. The reversal of 28021850 is 5812082.

It can be written as a sum of positive squares in 3 ways, for example, as 22024249 + 5997601 = 4693^2 + 2449^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 280169 + ... + 280268.

Almost surely, 2^28021850 is an apocalyptic number.

28021850 is a deficient number, since it is larger than the sum of its proper divisors (24098884).

28021850 is a wasteful number, since it uses less digits than its factorization.

28021850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560449 (or 560444 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 28021850 is about 5293.5668504327. The cubic root of 28021850 is about 303.7378641135.

The spelling of 28021850 in words is "twenty-eight million, twenty-one thousand, eight hundred fifty".