28317718408 has 64 divisors (see below), whose sum is σ = 63950976000. Its totient is φ = 11483664192.

The previous prime is 28317718393. The next prime is 28317718433. The reversal of 28317718408 is 80481771382.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 898485 + ... + 929467.

It is an arithmetic number, because the mean of its divisors is an integer number (999234000).

Almost surely, 2^28317718408 is an apocalyptic number.

28317718408 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28317718408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31975488000).

28317718408 is an abundant number, since it is smaller than the sum of its proper divisors (35633257592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28317718408 is a wasteful number, since it uses less digits than its factorization.

28317718408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31874 (or 31870 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 49.

The spelling of 28317718408 in words is "twenty-eight billion, three hundred seventeen million, seven hundred eighteen thousand, four hundred eight".