28250875985 has 4 divisors (see below), whose sum is σ = 33901051188. Its totient is φ = 22600700784.

The previous prime is 28250875979. The next prime is 28250875987. The reversal of 28250875985 is 58957805282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21291479056 + 6959396929 = 145916^2 + 83423^2 .

It is a cyclic number.

It is not a de Polignac number, because 28250875985 - 2⁴ = 28250875969 is a prime.

It is a super-2 number, since 2×28250875985² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28250875987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2825087594 + ... + 2825087603.

It is an arithmetic number, because the mean of its divisors is an integer number (8475262797).

Almost surely, 2^28250875985 is an apocalyptic number.

It is an amenable number.

28250875985 is a deficient number, since it is larger than the sum of its proper divisors (5650175203).

28250875985 is an equidigital number, since it uses as much as digits as its factorization.

28250875985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5650175202.

The product of its (nonzero) digits is 16128000, while the sum is 59.

The spelling of 28250875985 in words is "twenty-eight billion, two hundred fifty million, eight hundred seventy-five thousand, nine hundred eighty-five".