28547715725 has 12 divisors (see below), whose sum is σ = 35406094356. Its totient is φ = 22833703680.

The previous prime is 28547715697. The next prime is 28547715737. The reversal of 28547715725 is 52751774582.

It can be written as a sum of positive squares in 6 ways, for example, as 4608508996 + 23939206729 = 67886^2 + 154723^2 .

It is not a de Polignac number, because 28547715725 - 2⁶ = 28547715661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 21719 + ... + 239931.

It is an arithmetic number, because the mean of its divisors is an integer number (2950507863).

Almost surely, 2^28547715725 is an apocalyptic number.

28547715725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28547715725 is a deficient number, since it is larger than the sum of its proper divisors (6858378631).

28547715725 is a wasteful number, since it uses less digits than its factorization.

28547715725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223456 (or 223451 counting only the distinct ones).

The product of its digits is 5488000, while the sum is 53.

The spelling of 28547715725 in words is "twenty-eight billion, five hundred forty-seven million, seven hundred fifteen thousand, seven hundred twenty-five".