28729571745 has 32 divisors (see below), whose sum is σ = 54818168832. Its totient is φ = 12562494912.

The previous prime is 28729571729. The next prime is 28729571747. The reversal of 28729571745 is 54717592782.

It is a happy number.

It is not a de Polignac number, because 28729571745 - 2⁴ = 28729571729 is a prime.

It is a super-2 number, since 2×28729571745² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28729571747) 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 31 ways as a sum of consecutive naturals, for example, 5945737 + ... + 5950566.

It is an arithmetic number, because the mean of its divisors is an integer number (1713067776).

Almost surely, 2^28729571745 is an apocalyptic number.

It is an amenable number.

28729571745 is a deficient number, since it is larger than the sum of its proper divisors (26088597087).

28729571745 is a wasteful number, since it uses less digits than its factorization.

28729571745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11896341.

The product of its digits is 9878400, while the sum is 57.

The spelling of 28729571745 in words is "twenty-eight billion, seven hundred twenty-nine million, five hundred seventy-one thousand, seven hundred forty-five".