28085605473 has 4 divisors (see below), whose sum is σ = 37447473968. Its totient is φ = 18723736980.

The previous prime is 28085605469. The next prime is 28085605477. The reversal of 28085605473 is 37450658082.

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 an interprime number because it is at equal distance from previous prime (28085605469) and next prime (28085605477).

It is not a de Polignac number, because 28085605473 - 2² = 28085605469 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28085605477) 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, 4680934243 + ... + 4680934248.

It is an arithmetic number, because the mean of its divisors is an integer number (9361868492).

Almost surely, 2^28085605473 is an apocalyptic number.

It is an amenable number.

28085605473 is a deficient number, since it is larger than the sum of its proper divisors (9361868495).

28085605473 is an equidigital number, since it uses as much as digits as its factorization.

28085605473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9361868494.

The product of its (nonzero) digits is 1612800, while the sum is 48.

The spelling of 28085605473 in words is "twenty-eight billion, eighty-five million, six hundred five thousand, four hundred seventy-three".