28404163617 has 4 divisors (see below), whose sum is σ = 37872218160. Its totient is φ = 18936109076.

The previous prime is 28404163609. The next prime is 28404163649. The reversal of 28404163617 is 71636140482.

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 28404163617 - 2³ = 28404163609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28404163607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4734027267 + ... + 4734027272.

It is an arithmetic number, because the mean of its divisors is an integer number (9468054540).

Almost surely, 2^28404163617 is an apocalyptic number.

It is an amenable number.

28404163617 is a deficient number, since it is larger than the sum of its proper divisors (9468054543).

28404163617 is an equidigital number, since it uses as much as digits as its factorization.

28404163617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9468054542.

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 28404163617 in words is "twenty-eight billion, four hundred four million, one hundred sixty-three thousand, six hundred seventeen".