28297728459 has 128 divisors (see below), whose sum is σ = 57662760960. Its totient is φ = 13237862400.

The previous prime is 28297728443. The next prime is 28297728467. The reversal of 28297728459 is 95482779282.

28297728459 is a `hidden beast` number, since 28 + 2 + 97 + 72 + 8 + 459 = 666.

It is not a de Polignac number, because 28297728459 - 2⁴ = 28297728443 is a prime.

It is a super-2 number, since 2×28297728459² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 28297728396 and 28297728405.

It is not an unprimeable number, because it can be changed into a prime (28297728469) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1095339 + ... + 1120875.

It is an arithmetic number, because the mean of its divisors is an integer number (450490320).

Almost surely, 2^28297728459 is an apocalyptic number.

28297728459 is an abundant number, since it is smaller than the sum of its proper divisors (29365032501).

28297728459 is a wasteful number, since it uses less digits than its factorization.

28297728459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25618 (or 25612 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 63.

The spelling of 28297728459 in words is "twenty-eight billion, two hundred ninety-seven million, seven hundred twenty-eight thousand, four hundred fifty-nine".