28057583957481 has 63 divisors (see below), whose sum is σ = 45555001914087. Its totient is φ = 17265061373040.

The previous prime is 28057583957453. The next prime is 28057583957531. The reversal of 28057583957481 is 18475938575082.

The square root of 28057583957481 is 5296941.

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

28057583957481 is a `hidden beast` number, since 2 + 8 + 0 + 5 + 7 + 58 + 3 + 95 + 7 + 481 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4150530171225 + 23907053786256 = 2037285^2 + 4889484^2 .

It is not a de Polignac number, because 28057583957481 - 2⁵ = 28057583957449 is a prime.

It is a super-2 number, since 2×28057583957481² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28057583957401) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 1859218746 + ... + 1859233836.

Almost surely, 2^{28057583957481} is an apocalyptic number.

28057583957481 is the 5296941-st square number.

28057583957481 is the 2648471-st centered octagonal number.

It is an amenable number.

28057583957481 is a deficient number, since it is larger than the sum of its proper divisors (17497417956606).

28057583957481 is an frugal number, since it uses more digits than its factorization.

28057583957481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30226 (or 15107 counting only the distinct ones).

The product of its (nonzero) digits is 677376000, while the sum is 72.

The spelling of 28057583957481 in words is "twenty-eight trillion, fifty-seven billion, five hundred eighty-three million, nine hundred fifty-seven thousand, four hundred eighty-one".