28380287 has 8 divisors (see below), whose sum is σ = 30604896. Its totient is φ = 26161632.

The previous prime is 28380263. The next prime is 28380343. The reversal of 28380287 is 78208382.

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 28380287 - 2⁶ = 28380223 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 28380287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28380227) 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, 16973 + ... + 18569.

It is an arithmetic number, because the mean of its divisors is an integer number (3825612).

Almost surely, 2^28380287 is an apocalyptic number.

28380287 is a deficient number, since it is larger than the sum of its proper divisors (2224609).

28380287 is a wasteful number, since it uses less digits than its factorization.

28380287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2977.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 28380287 is about 5327.3151774604. The cubic root of 28380287 is about 305.0274525142.

The spelling of 28380287 in words is "twenty-eight million, three hundred eighty thousand, two hundred eighty-seven".