28621869085 has 4 divisors (see below), whose sum is σ = 34346242908. Its totient is φ = 22897495264.

The previous prime is 28621869077. The next prime is 28621869091. The reversal of 28621869085 is 58096812682.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58096812682 = 2 ⋅29048406341.

It can be written as a sum of positive squares in 2 ways, for example, as 4501604836 + 24120264249 = 67094^2 + 155307^2 .

It is a cyclic number.

It is not a de Polignac number, because 28621869085 - 2³ = 28621869077 is a prime.

It is a super-2 number, since 2×28621869085² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2862186904 + ... + 2862186913.

It is an arithmetic number, because the mean of its divisors is an integer number (8586560727).

Almost surely, 2^28621869085 is an apocalyptic number.

It is an amenable number.

28621869085 is a deficient number, since it is larger than the sum of its proper divisors (5724373823).

28621869085 is an equidigital number, since it uses as much as digits as its factorization.

28621869085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5724373822.

The product of its (nonzero) digits is 3317760, while the sum is 55.

The spelling of 28621869085 in words is "twenty-eight billion, six hundred twenty-one million, eight hundred sixty-nine thousand, eighty-five".