28255027581 has 40 divisors (see below), whose sum is σ = 46229043168. Its totient is φ = 17055900000.

The previous prime is 28255027579. The next prime is 28255027597. The reversal of 28255027581 is 18572055282.

28255027581 is a `hidden beast` number, since 28 + 2 + 550 + 2 + 75 + 8 + 1 = 666.

It is not a de Polignac number, because 28255027581 - 2¹ = 28255027579 is a prime.

It is a super-2 number, since 2×28255027581² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28255027181) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 160471 + ... + 286811.

Almost surely, 2^28255027581 is an apocalyptic number.

It is an amenable number.

28255027581 is a deficient number, since it is larger than the sum of its proper divisors (17974015587).

28255027581 is a wasteful number, since it uses less digits than its factorization.

28255027581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126615 (or 126606 counting only the distinct ones).

The product of its (nonzero) digits is 448000, while the sum is 45.

The spelling of 28255027581 in words is "twenty-eight billion, two hundred fifty-five million, twenty-seven thousand, five hundred eighty-one".