28155755585 has 8 divisors (see below), whose sum is σ = 33803376360. Its totient is φ = 22513624704.

The previous prime is 28155755531. The next prime is 28155755609. The reversal of 28155755585 is 58555755182.

It can be written as a sum of positive squares in 4 ways, for example, as 9143758129 + 19011997456 = 95623^2 + 137884^2 .

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 28155755585 - 2¹² = 28155751489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28155755585.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1361180 + ... + 1381709.

It is an arithmetic number, because the mean of its divisors is an integer number (4225422045).

Almost surely, 2^28155755585 is an apocalyptic number.

It is an amenable number.

28155755585 is a deficient number, since it is larger than the sum of its proper divisors (5647620775).

28155755585 is a wasteful number, since it uses less digits than its factorization.

28155755585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2744947.

The product of its digits is 14000000, while the sum is 56.

The spelling of 28155755585 in words is "twenty-eight billion, one hundred fifty-five million, seven hundred fifty-five thousand, five hundred eighty-five".