28005282531 has 12 divisors (see below), whose sum is σ = 40598114752. Its totient is φ = 18602785296.

The previous prime is 28005282527. The next prime is 28005282551. The reversal of 28005282531 is 13528250082.

28005282531 is a `hidden beast` number, since 2 + 80 + 0 + 528 + 2 + 53 + 1 = 666.

It is not a de Polignac number, because 28005282531 - 2² = 28005282527 is a prime.

It is a super-2 number, since 2×28005282531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28005282551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5614291 + ... + 5619276.

Almost surely, 2^28005282531 is an apocalyptic number.

28005282531 is a deficient number, since it is larger than the sum of its proper divisors (12592832221).

28005282531 is a wasteful number, since it uses less digits than its factorization.

28005282531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11233850 (or 11233847 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The spelling of 28005282531 in words is "twenty-eight billion, five million, two hundred eighty-two thousand, five hundred thirty-one".