28131406823 has 8 divisors (see below), whose sum is σ = 30313558128. Its totient is φ = 25951855104.

The previous prime is 28131406817. The next prime is 28131406843. The reversal of 28131406823 is 32860413182.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28131406823 - 2¹⁴ = 28131390439 is a prime.

It is a super-2 number, since 2×28131406823² (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 (28131406813) 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 7 ways as a sum of consecutive naturals, for example, 627386 + ... + 670727.

It is an arithmetic number, because the mean of its divisors is an integer number (3789194766).

Almost surely, 2^28131406823 is an apocalyptic number.

28131406823 is a deficient number, since it is larger than the sum of its proper divisors (2182151305).

28131406823 is a wasteful number, since it uses less digits than its factorization.

28131406823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299793.

The product of its (nonzero) digits is 55296, while the sum is 38.

The spelling of 28131406823 in words is "twenty-eight billion, one hundred thirty-one million, four hundred six thousand, eight hundred twenty-three".