28343208961 has 4 divisors (see below), whose sum is σ = 28343577172. Its totient is φ = 28342840752.

The previous prime is 28343208853. The next prime is 28343208967. The reversal of 28343208961 is 16980234382.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16980234382 = 2 ⋅8490117191.

It can be written as a sum of positive squares in 2 ways, for example, as 26968208400 + 1375000561 = 164220^2 + 37081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28343208961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28343208967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19710 + ... + 238903.

It is an arithmetic number, because the mean of its divisors is an integer number (7085894293).

Almost surely, 2^28343208961 is an apocalyptic number.

It is an amenable number.

28343208961 is a deficient number, since it is larger than the sum of its proper divisors (368211).

28343208961 is a wasteful number, since it uses less digits than its factorization.

28343208961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368210.

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 28343208961 in words is "twenty-eight billion, three hundred forty-three million, two hundred eight thousand, nine hundred sixty-one".