28365556673 has 4 divisors (see below), whose sum is σ = 28846328880. Its totient is φ = 27884784468.

The previous prime is 28365556657. The next prime is 28365556691. The reversal of 28365556673 is 37665556382.

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 28365556673 - 2⁴ = 28365556657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28365556603) 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, 240386015 + ... + 240386132.

It is an arithmetic number, because the mean of its divisors is an integer number (7211582220).

Almost surely, 2^28365556673 is an apocalyptic number.

It is an amenable number.

28365556673 is a deficient number, since it is larger than the sum of its proper divisors (480772207).

28365556673 is an equidigital number, since it uses as much as digits as its factorization.

28365556673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480772206.

The product of its digits is 27216000, while the sum is 56.

The spelling of 28365556673 in words is "twenty-eight billion, three hundred sixty-five million, five hundred fifty-six thousand, six hundred seventy-three".