28248891669 has 24 divisors (see below), whose sum is σ = 42326286912. Its totient is φ = 18827665920.

The previous prime is 28248891661. The next prime is 28248891679. The reversal of 28248891669 is 96619884282.

28248891669 is a `hidden beast` number, since 2 + 8 + 2 + 488 + 91 + 6 + 69 = 666.

It is not a de Polignac number, because 28248891669 - 2³ = 28248891661 is a prime.

It is a super-2 number, since 2×28248891669² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28248891661) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1075912 + ... + 1101854.

It is an arithmetic number, because the mean of its divisors is an integer number (1763595288).

Almost surely, 2^28248891669 is an apocalyptic number.

It is an amenable number.

28248891669 is a deficient number, since it is larger than the sum of its proper divisors (14077395243).

28248891669 is an equidigital number, since it uses as much as digits as its factorization.

28248891669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30439 (or 30427 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 63.

The spelling of 28248891669 in words is "twenty-eight billion, two hundred forty-eight million, eight hundred ninety-one thousand, six hundred sixty-nine".