28239049505 has 8 divisors (see below), whose sum is σ = 34713368424. Its totient is φ = 22040233600.

The previous prime is 28239049477. The next prime is 28239049529. The reversal of 28239049505 is 50594093282.

It can be written as a sum of positive squares in 4 ways, for example, as 2101213921 + 26137835584 = 45839^2 + 161672^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-28239049505 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28239049505.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 68875526 + ... + 68875935.

It is an arithmetic number, because the mean of its divisors is an integer number (4339171053).

Almost surely, 2^28239049505 is an apocalyptic number.

It is an amenable number.

28239049505 is a deficient number, since it is larger than the sum of its proper divisors (6474318919).

28239049505 is a wasteful number, since it uses less digits than its factorization.

28239049505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137751507.

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 28239049505 in words is "twenty-eight billion, two hundred thirty-nine million, forty-nine thousand, five hundred five".