28133317645 has 8 divisors (see below), whose sum is σ = 33761722104. Its totient is φ = 22505493504.

The previous prime is 28133317637. The next prime is 28133317699. The reversal of 28133317645 is 54671333182.

It can be written as a sum of positive squares in 4 ways, for example, as 15729156 + 28117588489 = 3966^2 + 167683^2 .

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 28133317645 - 2³ = 28133317637 is a prime.

It is a super-3 number, since 3×28133317645³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30144 + ... + 239113.

It is an arithmetic number, because the mean of its divisors is an integer number (4220215263).

Almost surely, 2^28133317645 is an apocalyptic number.

It is an amenable number.

28133317645 is a deficient number, since it is larger than the sum of its proper divisors (5628404459).

28133317645 is a wasteful number, since it uses less digits than its factorization.

28133317645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290159.

The product of its digits is 362880, while the sum is 43.

The spelling of 28133317645 in words is "twenty-eight billion, one hundred thirty-three million, three hundred seventeen thousand, six hundred forty-five".