28657605061 has 4 divisors (see below), whose sum is σ = 28663008300. Its totient is φ = 28652201824.

The previous prime is 28657605059. The next prime is 28657605071. The reversal of 28657605061 is 16050675682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14669812161 + 13987792900 = 121119^2 + 118270^2 .

It is a cyclic number.

It is not a de Polignac number, because 28657605061 - 2¹ = 28657605059 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 (28657605071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2693656 + ... + 2704273.

It is an arithmetic number, because the mean of its divisors is an integer number (7165752075).

Almost surely, 2^28657605061 is an apocalyptic number.

It is an amenable number.

28657605061 is a deficient number, since it is larger than the sum of its proper divisors (5403239).

28657605061 is an equidigital number, since it uses as much as digits as its factorization.

28657605061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5403238.

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 28657605061 in words is "twenty-eight billion, six hundred fifty-seven million, six hundred five thousand, sixty-one".