28131544608405 has 32 divisors (see below), whose sum is σ = 51631767532800. Its totient is φ = 12812327473152.

The previous prime is 28131544608397. The next prime is 28131544608521. The reversal of 28131544608405 is 50480644513182.

It is not a de Polignac number, because 28131544608405 - 2³ = 28131544608397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 497963340 + ... + 498019829.

It is an arithmetic number, because the mean of its divisors is an integer number (1613492735400).

Almost surely, 2^{28131544608405} is an apocalyptic number.

It is an amenable number.

28131544608405 is a deficient number, since it is larger than the sum of its proper divisors (23500222924395).

28131544608405 is a wasteful number, since it uses less digits than its factorization.

28131544608405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995983453.

The product of its (nonzero) digits is 3686400, while the sum is 51.

The spelling of 28131544608405 in words is "twenty-eight trillion, one hundred thirty-one billion, five hundred forty-four million, six hundred eight thousand, four hundred five".