28456782775 has 12 divisors (see below), whose sum is σ = 36820603152. Its totient is φ = 21775624640.

The previous prime is 28456782773. The next prime is 28456782779. The reversal of 28456782775 is 57728765482.

It is not a de Polignac number, because 28456782775 - 2¹ = 28456782773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28456782773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24744454 + ... + 24745603.

It is an arithmetic number, because the mean of its divisors is an integer number (3068383596).

Almost surely, 2^28456782775 is an apocalyptic number.

28456782775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28456782775 is a deficient number, since it is larger than the sum of its proper divisors (8363820377).

28456782775 is a wasteful number, since it uses less digits than its factorization.

28456782775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49490090 (or 49490085 counting only the distinct ones).

The product of its digits is 52684800, while the sum is 61.

The spelling of 28456782775 in words is "twenty-eight billion, four hundred fifty-six million, seven hundred eighty-two thousand, seven hundred seventy-five".