28001866 has 16 divisors (see below), whose sum is σ = 43914240. Its totient is φ = 13375440.

The previous prime is 28001837. The next prime is 28001881. The reversal of 28001866 is 66810082.

It is a Harshad number since it is a multiple of its sum of digits (31).

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, 2040 + ... + 7756.

It is an arithmetic number, because the mean of its divisors is an integer number (2744640).

Almost surely, 2^28001866 is an apocalyptic number.

28001866 is a deficient number, since it is larger than the sum of its proper divisors (15912374).

28001866 is a wasteful number, since it uses less digits than its factorization.

28001866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5829.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 28001866 is about 5291.6789396183. The cubic root of 28001866 is about 303.6656426032.

The spelling of 28001866 in words is "twenty-eight million, one thousand, eight hundred sixty-six".