28173200765 has 4 divisors (see below), whose sum is σ = 33807840924. Its totient is φ = 22538560608.

The previous prime is 28173200707. The next prime is 28173200771. The reversal of 28173200765 is 56700237182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16955425369 + 11217775396 = 130213^2 + 105914^2 .

It is a cyclic number.

It is not a de Polignac number, because 28173200765 - 2¹⁴ = 28173184381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2817320072 + ... + 2817320081.

It is an arithmetic number, because the mean of its divisors is an integer number (8451960231).

Almost surely, 2^28173200765 is an apocalyptic number.

It is an amenable number.

28173200765 is a deficient number, since it is larger than the sum of its proper divisors (5634640159).

28173200765 is an equidigital number, since it uses as much as digits as its factorization.

28173200765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5634640158.

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 28173200765 in words is "twenty-eight billion, one hundred seventy-three million, two hundred thousand, seven hundred sixty-five".