28702235609 has 4 divisors (see below), whose sum is σ = 28702885860. Its totient is φ = 28701585360.

The previous prime is 28702235599. The next prime is 28702235669. The reversal of 28702235609 is 90653220782.

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 5355312400 + 23346923209 = 73180^2 + 152797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28702235609 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 28702235609.

It is not an unprimeable number, because it can be changed into a prime (28702235669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253682 + ... + 348939.

It is an arithmetic number, because the mean of its divisors is an integer number (7175721465).

Almost surely, 2^28702235609 is an apocalyptic number.

It is an amenable number.

28702235609 is a deficient number, since it is larger than the sum of its proper divisors (650251).

28702235609 is an equidigital number, since it uses as much as digits as its factorization.

28702235609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650250.

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 28702235609 in words is "twenty-eight billion, seven hundred two million, two hundred thirty-five thousand, six hundred nine".