28517752385 has 8 divisors (see below), whose sum is σ = 34229688360. Its totient is φ = 22808611584.

The previous prime is 28517752379. The next prime is 28517752391. The reversal of 28517752385 is 58325771582.

It is a happy number.

It is a Cunningham number, because it is equal to 168872²+1.

It is an interprime number because it is at equal distance from previous prime (28517752379) and next prime (28517752391).

It can be written as a sum of positive squares in 4 ways, for example, as 10266552976 + 18251199409 = 101324^2 + 135097^2 .

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 28517752385 - 2⁶ = 28517752321 is a prime.

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, 676280 + ... + 717209.

It is an arithmetic number, because the mean of its divisors is an integer number (4278711045).

Almost surely, 2^28517752385 is an apocalyptic number.

It is an amenable number.

28517752385 is a deficient number, since it is larger than the sum of its proper divisors (5711935975).

28517752385 is a wasteful number, since it uses less digits than its factorization.

28517752385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397587.

The product of its digits is 4704000, while the sum is 53.

The spelling of 28517752385 in words is "twenty-eight billion, five hundred seventeen million, seven hundred fifty-two thousand, three hundred eighty-five".