28731728857143 has 64 divisors (see below), whose sum is σ = 43831977541632. Its totient is φ = 16584169512960.

The previous prime is 28731728857127. The next prime is 28731728857151. The reversal of 28731728857143 is 34175882713782.

It is not a de Polignac number, because 28731728857143 - 2⁴ = 28731728857127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28731728857163) 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 63 ways as a sum of consecutive naturals, for example, 357885055 + ... + 357965327.

It is an arithmetic number, because the mean of its divisors is an integer number (684874649088).

Almost surely, 2^{28731728857143} is an apocalyptic number.

28731728857143 is a deficient number, since it is larger than the sum of its proper divisors (15100248684489).

28731728857143 is a wasteful number, since it uses less digits than its factorization.

28731728857143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82144.

The product of its digits is 126443520, while the sum is 66.

The spelling of 28731728857143 in words is "twenty-eight trillion, seven hundred thirty-one billion, seven hundred twenty-eight million, eight hundred fifty-seven thousand, one hundred forty-three".