28317718505 has 8 divisors (see below), whose sum is σ = 34488445632. Its totient is φ = 22316052528.

The previous prime is 28317718493. The next prime is 28317718511. The reversal of 28317718505 is 50581771382.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28317718505 - 2⁴ = 28317718489 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 28317718505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42264917 + ... + 42265586.

It is an arithmetic number, because the mean of its divisors is an integer number (4311055704).

Almost surely, 2^28317718505 is an apocalyptic number.

It is an amenable number.

28317718505 is a deficient number, since it is larger than the sum of its proper divisors (6170727127).

28317718505 is an equidigital number, since it uses as much as digits as its factorization.

28317718505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84530575.

The product of its (nonzero) digits is 470400, while the sum is 47.

The spelling of 28317718505 in words is "twenty-eight billion, three hundred seventeen million, seven hundred eighteen thousand, five hundred five".