28770405173 has 4 divisors (see below), whose sum is σ = 29762488140. Its totient is φ = 27778322208.

The previous prime is 28770405133. The next prime is 28770405179. The reversal of 28770405173 is 37150407782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37150407782 = 2 ⋅18575203891.

It can be written as a sum of positive squares in 2 ways, for example, as 4603215409 + 24167189764 = 67847^2 + 155458^2 .

It is a cyclic number.

It is not a de Polignac number, because 28770405173 - 2⁸ = 28770404917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28770405179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 496041440 + ... + 496041497.

It is an arithmetic number, because the mean of its divisors is an integer number (7440622035).

Almost surely, 2^28770405173 is an apocalyptic number.

It is an amenable number.

28770405173 is a deficient number, since it is larger than the sum of its proper divisors (992082967).

28770405173 is an equidigital number, since it uses as much as digits as its factorization.

28770405173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992082966.

The product of its (nonzero) digits is 329280, while the sum is 44.

The spelling of 28770405173 in words is "twenty-eight billion, seven hundred seventy million, four hundred five thousand, one hundred seventy-three".