28399146209 has 4 divisors (see below), whose sum is σ = 32456167104. Its totient is φ = 24342125316.

The previous prime is 28399146203. The next prime is 28399146257. The reversal of 28399146209 is 90264199382.

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 28399146209 - 2¹² = 28399142113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28399146203) 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, 2028510437 + ... + 2028510450.

It is an arithmetic number, because the mean of its divisors is an integer number (8114041776).

Almost surely, 2^28399146209 is an apocalyptic number.

It is an amenable number.

28399146209 is a deficient number, since it is larger than the sum of its proper divisors (4057020895).

28399146209 is an equidigital number, since it uses as much as digits as its factorization.

28399146209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4057020894.

The product of its (nonzero) digits is 1679616, while the sum is 53.

The spelling of 28399146209 in words is "twenty-eight billion, three hundred ninety-nine million, one hundred forty-six thousand, two hundred nine".