28200491 has 8 divisors (see below), whose sum is σ = 30990384. Its totient is φ = 25448320.

The previous prime is 28200457. The next prime is 28200509. The reversal of 28200491 is 19400282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28200491 - 2¹⁰ = 28199467 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28200491.

It is not an unprimeable number, because it can be changed into a prime (28200191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7850 + ... + 10863.

It is an arithmetic number, because the mean of its divisors is an integer number (3873798).

Almost surely, 2^28200491 is an apocalyptic number.

28200491 is a deficient number, since it is larger than the sum of its proper divisors (2789893).

28200491 is a wasteful number, since it uses less digits than its factorization.

28200491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18861.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 28200491 is about 5310.4134490640. The cubic root of 28200491 is about 304.3819464843.

The spelling of 28200491 in words is "twenty-eight million, two hundred thousand, four hundred ninety-one".