28873172923 has 12 divisors (see below), whose sum is σ = 33682328280. Its totient is φ = 24678310272.

The previous prime is 28873172921. The next prime is 28873172989. The reversal of 28873172923 is 32927137882.

It is a happy number.

It is not a de Polignac number, because 28873172923 - 2¹ = 28873172921 is a prime.

It is a super-2 number, since 2×28873172923² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28873172921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 817333 + ... + 851926.

It is an arithmetic number, because the mean of its divisors is an integer number (2806860690).

Almost surely, 2^28873172923 is an apocalyptic number.

28873172923 is a deficient number, since it is larger than the sum of its proper divisors (4809155357).

28873172923 is a wasteful number, since it uses less digits than its factorization.

28873172923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669626 (or 1669619 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 52.

The spelling of 28873172923 in words is "twenty-eight billion, eight hundred seventy-three million, one hundred seventy-two thousand, nine hundred twenty-three".