28717144831 has 4 divisors (see below), whose sum is σ = 28820817112. Its totient is φ = 28613472552.

The previous prime is 28717144829. The next prime is 28717144843. The reversal of 28717144831 is 13844171782.

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

It is a cyclic number.

It is not a de Polignac number, because 28717144831 - 2¹ = 28717144829 is a prime.

It is a super-2 number, since 2×28717144831² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28717444831) 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, 51835725 + ... + 51836278.

It is an arithmetic number, because the mean of its divisors is an integer number (7205204278).

Almost surely, 2^28717144831 is an apocalyptic number.

28717144831 is a deficient number, since it is larger than the sum of its proper divisors (103672281).

28717144831 is a wasteful number, since it uses less digits than its factorization.

28717144831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103672280.

The product of its digits is 301056, while the sum is 46.

The spelling of 28717144831 in words is "twenty-eight billion, seven hundred seventeen million, one hundred forty-four thousand, eight hundred thirty-one".