28001798 has 16 divisors (see below), whose sum is σ = 45907344. Its totient is φ = 12704160.

The previous prime is 28001789. The next prime is 28001819. The reversal of 28001798 is 89710082.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16736 + ... + 18332.

It is an arithmetic number, because the mean of its divisors is an integer number (2869209).

Almost surely, 2^28001798 is an apocalyptic number.

28001798 is a deficient number, since it is larger than the sum of its proper divisors (17905546).

28001798 is a wasteful number, since it uses less digits than its factorization.

28001798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2407.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 28001798 is about 5291.6725144325. The cubic root of 28001798 is about 303.6653967948.

The spelling of 28001798 in words is "twenty-eight million, one thousand, seven hundred ninety-eight".