28316312805 has 32 divisors (see below), whose sum is σ = 51573749760. Its totient is φ = 13132201280.

The previous prime is 28316312747. The next prime is 28316312821. The reversal of 28316312805 is 50821361382.

It is not a de Polignac number, because 28316312805 - 2²¹ = 28314215653 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3726945 + ... + 3734534.

It is an arithmetic number, because the mean of its divisors is an integer number (1611679680).

Almost surely, 2^28316312805 is an apocalyptic number.

It is an amenable number.

28316312805 is a deficient number, since it is larger than the sum of its proper divisors (23257436955).

28316312805 is a wasteful number, since it uses less digits than its factorization.

28316312805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7461521.

The product of its (nonzero) digits is 69120, while the sum is 39.

The spelling of 28316312805 in words is "twenty-eight billion, three hundred sixteen million, three hundred twelve thousand, eight hundred five".