28143540973 has 4 divisors (see below), whose sum is σ = 28143882720. Its totient is φ = 28143199228.

The previous prime is 28143540937. The next prime is 28143540977. The reversal of 28143540973 is 37904534182.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 37904534182 = 2 ⋅18952267091.

It is a cyclic number.

It is not a de Polignac number, because 28143540973 - 2⁹ = 28143540461 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 (28143540977) 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, 36738 + ... + 240076.

It is an arithmetic number, because the mean of its divisors is an integer number (7035970680).

Almost surely, 2^28143540973 is an apocalyptic number.

It is an amenable number.

28143540973 is a deficient number, since it is larger than the sum of its proper divisors (341747).

28143540973 is a wasteful number, since it uses less digits than its factorization.

28143540973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341746.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 28143540973 in words is "twenty-eight billion, one hundred forty-three million, five hundred forty thousand, nine hundred seventy-three".