28531253687 has 4 divisors (see below), whose sum is σ = 28531675200. Its totient is φ = 28530832176.

The previous prime is 28531253683. The next prime is 28531253701. The reversal of 28531253687 is 78635213582.

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 28531253687 - 2² = 28531253683 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 (28531253683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83687 + ... + 253112.

It is an arithmetic number, because the mean of its divisors is an integer number (7132918800).

Almost surely, 2^28531253687 is an apocalyptic number.

28531253687 is a deficient number, since it is larger than the sum of its proper divisors (421513).

28531253687 is an equidigital number, since it uses as much as digits as its factorization.

28531253687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421512.

The product of its digits is 2419200, while the sum is 50.

The spelling of 28531253687 in words is "twenty-eight billion, five hundred thirty-one million, two hundred fifty-three thousand, six hundred eighty-seven".