28317587107885 has 16 divisors (see below), whose sum is σ = 34904415312432. Its totient is φ = 22038701184000.

The previous prime is 28317587107871. The next prime is 28317587107891. The reversal of 28317587107885 is 58870178571382.

It can be written as a sum of positive squares in 8 ways, for example, as 1815158009284 + 26502429098601 = 1347278^2 + 5148051^2 .

It is not a de Polignac number, because 28317587107885 - 2⁷ = 28317587107757 is a prime.

It is a super-2 number, since 2×28317587107885² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9430266 + ... + 12065035.

It is an arithmetic number, because the mean of its divisors is an integer number (2181525957027).

Almost surely, 2^{28317587107885} is an apocalyptic number.

It is an amenable number.

28317587107885 is a deficient number, since it is larger than the sum of its proper divisors (6586828204547).

28317587107885 is a wasteful number, since it uses less digits than its factorization.

28317587107885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21502464.

The product of its (nonzero) digits is 210739200, while the sum is 70.

The spelling of 28317587107885 in words is "twenty-eight trillion, three hundred seventeen billion, five hundred eighty-seven million, one hundred seven thousand, eight hundred eighty-five".