28285487505 has 48 divisors (see below), whose sum is σ = 54729170496. Its totient is φ = 13395231360.

The previous prime is 28285487471. The next prime is 28285487509. The reversal of 28285487505 is 50578458282.

28285487505 is a `hidden beast` number, since 2 + 8 + 2 + 8 + 54 + 87 + 505 = 666.

It is not a de Polignac number, because 28285487505 - 2⁶ = 28285487441 is a prime.

It is a super-2 number, since 2×28285487505² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28285487509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 643162 + ... + 685731.

It is an arithmetic number, because the mean of its divisors is an integer number (1140191052).

Almost surely, 2^28285487505 is an apocalyptic number.

It is an amenable number.

28285487505 is a deficient number, since it is larger than the sum of its proper divisors (26443682991).

28285487505 is a wasteful number, since it uses less digits than its factorization.

28285487505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328958 (or 1328955 counting only the distinct ones).

The product of its (nonzero) digits is 7168000, while the sum is 54.

The spelling of 28285487505 in words is "twenty-eight billion, two hundred eighty-five million, four hundred eighty-seven thousand, five hundred five".