28617712805 has 8 divisors (see below), whose sum is σ = 37463187744. Its totient is φ = 20812882000.

The previous prime is 28617712801. The next prime is 28617712831. The reversal of 28617712805 is 50821771682.

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

It is not a de Polignac number, because 28617712805 - 2² = 28617712801 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 28617712805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28617712801) 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, 260160971 + ... + 260161080.

It is an arithmetic number, because the mean of its divisors is an integer number (4682898468).

Almost surely, 2^28617712805 is an apocalyptic number.

It is an amenable number.

28617712805 is a deficient number, since it is larger than the sum of its proper divisors (8845474939).

28617712805 is a wasteful number, since it uses less digits than its factorization.

28617712805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520322067.

The product of its (nonzero) digits is 376320, while the sum is 47.

The spelling of 28617712805 in words is "twenty-eight billion, six hundred seventeen million, seven hundred twelve thousand, eight hundred five".