28662040661 has 4 divisors (see below), whose sum is σ = 28854403500. Its totient is φ = 28469677824.

The previous prime is 28662040657. The next prime is 28662040669. The reversal of 28662040661 is 16604026682.

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 3920638225 + 24741402436 = 62615^2 + 157294^2 .

It is a cyclic number.

It is not a de Polignac number, because 28662040661 - 2² = 28662040657 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 (28662040669) 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, 96181196 + ... + 96181493.

It is an arithmetic number, because the mean of its divisors is an integer number (7213600875).

Almost surely, 2^28662040661 is an apocalyptic number.

It is an amenable number.

28662040661 is a deficient number, since it is larger than the sum of its proper divisors (192362839).

28662040661 is a wasteful number, since it uses less digits than its factorization.

28662040661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192362838.

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 28662040661 in words is "twenty-eight billion, six hundred sixty-two million, forty thousand, six hundred sixty-one".