28828393609 has 4 divisors (see below), whose sum is σ = 28902502980. Its totient is φ = 28754284240.

The previous prime is 28828393589. The next prime is 28828393687. The reversal of 28828393609 is 90639382882.

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 5928230025 + 22900163584 = 76995^2 + 151328^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28828393609 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28828390609) 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, 37054102 + ... + 37054879.

It is an arithmetic number, because the mean of its divisors is an integer number (7225625745).

Almost surely, 2^28828393609 is an apocalyptic number.

It is an amenable number.

28828393609 is a deficient number, since it is larger than the sum of its proper divisors (74109371).

28828393609 is an equidigital number, since it uses as much as digits as its factorization.

28828393609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74109370.

The product of its (nonzero) digits is 8957952, while the sum is 58.

The spelling of 28828393609 in words is "twenty-eight billion, eight hundred twenty-eight million, three hundred ninety-three thousand, six hundred nine".