28320642461 has 2 divisors, whose sum is σ = 28320642462. Its totient is φ = 28320642460.

The previous prime is 28320642419. The next prime is 28320642487. The reversal of 28320642461 is 16424602382.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25917780100 + 2402862361 = 160990^2 + 49019^2 .

It is a cyclic number.

It is not a de Polignac number, because 28320642461 - 2¹⁸ = 28320380317 is a prime.

It is a super-2 number, since 2×28320642461² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28320642401) by changing a digit.

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 as a sum of consecutive naturals, namely, 14160321230 + 14160321231.

It is an arithmetic number, because the mean of its divisors is an integer number (14160321231).

Almost surely, 2^28320642461 is an apocalyptic number.

It is an amenable number.

28320642461 is a deficient number, since it is larger than the sum of its proper divisors (1).

28320642461 is an equidigital number, since it uses as much as digits as its factorization.

28320642461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 38.

The spelling of 28320642461 in words is "twenty-eight billion, three hundred twenty million, six hundred forty-two thousand, four hundred sixty-one".