28216826131 has 4 divisors (see below), whose sum is σ = 30387351232. Its totient is φ = 26046301032.

The previous prime is 28216826129. The next prime is 28216826159. The reversal of 28216826131 is 13162861282.

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 28216826131 - 2¹ = 28216826129 is a prime.

It is a super-2 number, since 2×28216826131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28216826161) 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, 1085262531 + ... + 1085262556.

It is an arithmetic number, because the mean of its divisors is an integer number (7596837808).

Almost surely, 2^28216826131 is an apocalyptic number.

28216826131 is a deficient number, since it is larger than the sum of its proper divisors (2170525101).

28216826131 is a wasteful number, since it uses less digits than its factorization.

28216826131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170525100.

The product of its digits is 55296, while the sum is 40.

The spelling of 28216826131 in words is "twenty-eight billion, two hundred sixteen million, eight hundred twenty-six thousand, one hundred thirty-one".