28342388661 has 12 divisors (see below), whose sum is σ = 40143545952. Its totient is φ = 17783459008.

The previous prime is 28342388653. The next prime is 28342388731. The reversal of 28342388661 is 16688324382.

It is not a de Polignac number, because 28342388661 - 2³ = 28342388653 is a prime.

It is a super-2 number, since 2×28342388661² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28342388651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16344225 + ... + 16345958.

It is an arithmetic number, because the mean of its divisors is an integer number (3345295496).

Almost surely, 2^28342388661 is an apocalyptic number.

It is an amenable number.

28342388661 is a deficient number, since it is larger than the sum of its proper divisors (11801157291).

28342388661 is a wasteful number, since it uses less digits than its factorization.

28342388661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32690220 (or 32690203 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 51.

The spelling of 28342388661 in words is "twenty-eight billion, three hundred forty-two million, three hundred eighty-eight thousand, six hundred sixty-one".