28807328566 has 4 divisors (see below), whose sum is σ = 43210992852. Its totient is φ = 14403664282.

The previous prime is 28807328521. The next prime is 28807328569. The reversal of 28807328566 is 66582370882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66582370882 = 2 ⋅33291185441.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28807328569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7201832140 + ... + 7201832143.

It is an arithmetic number, because the mean of its divisors is an integer number (10802748213).

Almost surely, 2^28807328566 is an apocalyptic number.

28807328566 is a deficient number, since it is larger than the sum of its proper divisors (14403664286).

28807328566 is a wasteful number, since it uses less digits than its factorization.

28807328566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14403664285.

The product of its (nonzero) digits is 7741440, while the sum is 55.

The spelling of 28807328566 in words is "twenty-eight billion, eight hundred seven million, three hundred twenty-eight thousand, five hundred sixty-six".