28604354561 has 2 divisors, whose sum is σ = 28604354562. Its totient is φ = 28604354560.

The previous prime is 28604354551. The next prime is 28604354573. The reversal of 28604354561 is 16545340682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17441164225 + 11163190336 = 132065^2 + 105656^2 .

It is a cyclic number.

It is not a de Polignac number, because 28604354561 - 2¹⁰ = 28604353537 is a prime.

It is not a weakly prime, because it can be changed into another prime (28604354551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14302177280 + 14302177281.

It is an arithmetic number, because the mean of its divisors is an integer number (14302177281).

Almost surely, 2^28604354561 is an apocalyptic number.

It is an amenable number.

28604354561 is a deficient number, since it is larger than the sum of its proper divisors (1).

28604354561 is an equidigital number, since it uses as much as digits as its factorization.

28604354561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 691200, while the sum is 44.

The spelling of 28604354561 in words is "twenty-eight billion, six hundred four million, three hundred fifty-four thousand, five hundred sixty-one".