28928268349 has 4 divisors (see below), whose sum is σ = 28933000540. Its totient is φ = 28923536160.

The previous prime is 28928268323. The next prime is 28928268353. The reversal of 28928268349 is 94386282982.

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 6353205849 + 22575062500 = 79707^2 + 150250^2 .

It is a cyclic number.

It is not a de Polignac number, because 28928268349 - 2¹⁹ = 28927744061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28928268389) 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 3 ways as a sum of consecutive naturals, for example, 2356914 + ... + 2369155.

It is an arithmetic number, because the mean of its divisors is an integer number (7233250135).

Almost surely, 2^28928268349 is an apocalyptic number.

It is an amenable number.

28928268349 is a deficient number, since it is larger than the sum of its proper divisors (4732191).

28928268349 is an equidigital number, since it uses as much as digits as its factorization.

28928268349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4732190.

The product of its digits is 23887872, while the sum is 61.

The spelling of 28928268349 in words is "twenty-eight billion, nine hundred twenty-eight million, two hundred sixty-eight thousand, three hundred forty-nine".