28528358481 has 24 divisors (see below), whose sum is σ = 47149474944. Its totient is φ = 16282866240.

The previous prime is 28528358479. The next prime is 28528358489. The reversal of 28528358481 is 18485382582.

28528358481 is a `hidden beast` number, since 2 + 8 + 52 + 8 + 3 + 584 + 8 + 1 = 666.

It is not a de Polignac number, because 28528358481 - 2¹ = 28528358479 is a prime.

It is a super-2 number, since 2×28528358481² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28528358489) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 210205 + ... + 318186.

It is an arithmetic number, because the mean of its divisors is an integer number (1964561456).

Almost surely, 2^28528358481 is an apocalyptic number.

28528358481 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28528358481 is a deficient number, since it is larger than the sum of its proper divisors (18621116463).

28528358481 is a wasteful number, since it uses less digits than its factorization.

28528358481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529261 (or 529258 counting only the distinct ones).

The product of its digits is 4915200, while the sum is 54.

The spelling of 28528358481 in words is "twenty-eight billion, five hundred twenty-eight million, three hundred fifty-eight thousand, four hundred eighty-one".