28121558345 has 16 divisors (see below), whose sum is σ = 33832691712. Its totient is φ = 22439446080.

The previous prime is 28121558299. The next prime is 28121558357. The reversal of 28121558345 is 54385512182.

It is not a de Polignac number, because 28121558345 - 2¹² = 28121554249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28121558296 and 28121558305.

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 15 ways as a sum of consecutive naturals, for example, 3331280 + ... + 3339710.

It is an arithmetic number, because the mean of its divisors is an integer number (2114543232).

Almost surely, 2^28121558345 is an apocalyptic number.

It is an amenable number.

28121558345 is a deficient number, since it is larger than the sum of its proper divisors (5711133367).

28121558345 is an equidigital number, since it uses as much as digits as its factorization.

28121558345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10072.

The product of its digits is 384000, while the sum is 44.

The spelling of 28121558345 in words is "twenty-eight billion, one hundred twenty-one million, five hundred fifty-eight thousand, three hundred forty-five".