28057860181 has 16 divisors (see below), whose sum is σ = 30735251568. Its totient is φ = 25455283200.

The previous prime is 28057860179. The next prime is 28057860221. The reversal of 28057860181 is 18106875082.

It can be written as a sum of positive squares in 8 ways, for example, as 17416080900 + 10641779281 = 131970^2 + 103159^2 .

It is a cyclic number.

It is not a de Polignac number, because 28057860181 - 2¹ = 28057860179 is a prime.

It is a super-2 number, since 2×28057860181² (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 (28057860161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1066275 + ... + 1092271.

It is an arithmetic number, because the mean of its divisors is an integer number (1920953223).

Almost surely, 2^28057860181 is an apocalyptic number.

It is an amenable number.

28057860181 is a deficient number, since it is larger than the sum of its proper divisors (2677391387).

28057860181 is a wasteful number, since it uses less digits than its factorization.

28057860181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27432.

The product of its (nonzero) digits is 215040, while the sum is 46.

The spelling of 28057860181 in words is "twenty-eight billion, fifty-seven million, eight hundred sixty thousand, one hundred eighty-one".