28257438585 has 8 divisors (see below), whose sum is σ = 45211901760. Its totient is φ = 15070633904.

The previous prime is 28257438569. The next prime is 28257438593. The reversal of 28257438585 is 58583475282.

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 28257438585 - 2⁴ = 28257438569 is a prime.

It is a Curzon number.

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, 941914605 + ... + 941914634.

It is an arithmetic number, because the mean of its divisors is an integer number (5651487720).

Almost surely, 2^28257438585 is an apocalyptic number.

It is an amenable number.

28257438585 is a deficient number, since it is larger than the sum of its proper divisors (16954463175).

28257438585 is a wasteful number, since it uses less digits than its factorization.

28257438585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883829247.

The product of its digits is 21504000, while the sum is 57.

The spelling of 28257438585 in words is "twenty-eight billion, two hundred fifty-seven million, four hundred thirty-eight thousand, five hundred eighty-five".