28028149349 has 4 divisors (see below), whose sum is σ = 28028624736. Its totient is φ = 28027673964.

The previous prime is 28028149337. The next prime is 28028149363. The reversal of 28028149349 is 94394182082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28028149349 - 2²⁸ = 27759713893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28028149297 and 28028149306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28028149309) by changing a digit.

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, 134249 + ... + 272174.

It is an arithmetic number, because the mean of its divisors is an integer number (7007156184).

Almost surely, 2^28028149349 is an apocalyptic number.

It is an amenable number.

28028149349 is a deficient number, since it is larger than the sum of its proper divisors (475387).

28028149349 is an equidigital number, since it uses as much as digits as its factorization.

28028149349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475386.

The product of its (nonzero) digits is 995328, while the sum is 50.

The spelling of 28028149349 in words is "twenty-eight billion, twenty-eight million, one hundred forty-nine thousand, three hundred forty-nine".