28580945481 has 81 divisors (see below), whose sum is σ = 46793114823. Its totient is φ = 16797702240.

The previous prime is 28580945441. The next prime is 28580945489. The reversal of 28580945481 is 18454908582.

The square root of 28580945481 is 169059.

It is a perfect power (a square), and thus also a powerful number.

28580945481 is a `hidden beast` number, since 2 + 8 + 5 + 8 + 0 + 94 + 548 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19920781881 + 8660163600 = 141141^2 + 93060^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28580945481 is a prime.

It is a super-2 number, since 2×28580945481² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28580945489) 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 80 ways as a sum of consecutive naturals, for example, 262210455 + ... + 262210563.

Almost surely, 2^28580945481 is an apocalyptic number.

28580945481 is the 169059-th square number.

28580945481 is the 84530-th centered octagonal number.

It is an amenable number.

28580945481 is a deficient number, since it is larger than the sum of its proper divisors (18212169342).

28580945481 is a wasteful number, since it uses less digits than its factorization.

28580945481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 3686400, while the sum is 54.

The spelling of 28580945481 in words is "twenty-eight billion, five hundred eighty million, nine hundred forty-five thousand, four hundred eighty-one".