28001799 has 12 divisors (see below), whose sum is σ = 46225296. Its totient is φ = 16000992.

The previous prime is 28001789. The next prime is 28001819. The reversal of 28001799 is 99710082.

It is a happy number.

It is not a de Polignac number, because 28001799 - 2⁵ = 28001767 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28001749) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 222174 + ... + 222299.

It is an arithmetic number, because the mean of its divisors is an integer number (3852108).

Almost surely, 2^28001799 is an apocalyptic number.

28001799 is a deficient number, since it is larger than the sum of its proper divisors (18223497).

28001799 is a wasteful number, since it uses less digits than its factorization.

28001799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444486 (or 444483 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 28001799 is about 5291.6726089205. The cubic root of 28001799 is about 303.6654004097.

The spelling of 28001799 in words is "twenty-eight million, one thousand, seven hundred ninety-nine".