28131544608423 has 4 divisors (see below), whose sum is σ = 37508726144568. Its totient is φ = 18754363072280.

The previous prime is 28131544608397. The next prime is 28131544608521. The reversal of 28131544608423 is 32480644513182.

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 28131544608423 - 2²² = 28131540414119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28130544608423) 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, 4688590768068 + ... + 4688590768073.

It is an arithmetic number, because the mean of its divisors is an integer number (9377181536142).

Almost surely, 2^{28131544608423} is an apocalyptic number.

28131544608423 is a deficient number, since it is larger than the sum of its proper divisors (9377181536145).

28131544608423 is an equidigital number, since it uses as much as digits as its factorization.

28131544608423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9377181536144.

The product of its (nonzero) digits is 4423680, while the sum is 51.

The spelling of 28131544608423 in words is "twenty-eight trillion, one hundred thirty-one billion, five hundred forty-four million, six hundred eight thousand, four hundred twenty-three".