28810750249 has 4 divisors (see below), whose sum is σ = 28811166660. Its totient is φ = 28810333840.

The previous prime is 28810750231. The next prime is 28810750261. The reversal of 28810750249 is 94205701882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94205701882 = 2 ⋅47102850941.

It can be written as a sum of positive squares in 2 ways, for example, as 7518103849 + 21292646400 = 86707^2 + 145920^2 .

It is a cyclic number.

It is not a de Polignac number, because 28810750249 - 2¹¹ = 28810748201 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28810750199 and 28810750208.

It is not an unprimeable number, because it can be changed into a prime (28810750219) 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, 76762 + ... + 252019.

It is an arithmetic number, because the mean of its divisors is an integer number (7202791665).

Almost surely, 2^28810750249 is an apocalyptic number.

It is an amenable number.

28810750249 is a deficient number, since it is larger than the sum of its proper divisors (416411).

28810750249 is an equidigital number, since it uses as much as digits as its factorization.

28810750249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416410.

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 28810750249 in words is "twenty-eight billion, eight hundred ten million, seven hundred fifty thousand, two hundred forty-nine".