28872409826 has 16 divisors (see below), whose sum is σ = 46840228344. Its totient is φ = 13268532864.

The previous prime is 28872409817. The next prime is 28872409849. The reversal of 28872409826 is 62890427882.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 24164391601 + 4708018225 = 155449^2 + 68615^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2376941 + ... + 2389056.

Almost surely, 2^28872409826 is an apocalyptic number.

28872409826 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28872409826 is a deficient number, since it is larger than the sum of its proper divisors (17967818518).

28872409826 is a wasteful number, since it uses less digits than its factorization.

28872409826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4766245.

The product of its (nonzero) digits is 6193152, while the sum is 56.

The spelling of 28872409826 in words is "twenty-eight billion, eight hundred seventy-two million, four hundred nine thousand, eight hundred twenty-six".