28717862566 has 4 divisors (see below), whose sum is σ = 43076793852. Its totient is φ = 14358931282.

The previous prime is 28717862489. The next prime is 28717862611. The reversal of 28717862566 is 66526871782.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 28717862566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7179465640 + ... + 7179465643.

It is an arithmetic number, because the mean of its divisors is an integer number (10769198463).

Almost surely, 2^28717862566 is an apocalyptic number.

28717862566 is a deficient number, since it is larger than the sum of its proper divisors (14358931286).

28717862566 is a wasteful number, since it uses less digits than its factorization.

28717862566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14358931285.

The product of its digits is 13547520, while the sum is 58.

The spelling of 28717862566 in words is "twenty-eight billion, seven hundred seventeen million, eight hundred sixty-two thousand, five hundred sixty-six".