28866566399 has 8 divisors (see below), whose sum is σ = 31495013760. Its totient is φ = 26238821400.

The previous prime is 28866566363. The next prime is 28866566401. The reversal of 28866566399 is 99366566882.

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

It is not a de Polignac number, because 28866566399 - 2¹² = 28866562303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28866566359) 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, 87737 + ... + 255794.

It is an arithmetic number, because the mean of its divisors is an integer number (3936876720).

Almost surely, 2^28866566399 is an apocalyptic number.

28866566399 is a deficient number, since it is larger than the sum of its proper divisors (2628447361).

28866566399 is a wasteful number, since it uses less digits than its factorization.

28866566399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351181.

The product of its digits is 201553920, while the sum is 68.

The spelling of 28866566399 in words is "twenty-eight billion, eight hundred sixty-six million, five hundred sixty-six thousand, three hundred ninety-nine".