1728488789 has 2 divisors, whose sum is σ = 1728488790. Its totient is φ = 1728488788.

The previous prime is 1728488777. The next prime is 1728488837. The reversal of 1728488789 is 9878848271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1608411025 + 120077764 = 40105^2 + 10958^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1728488789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1728488989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 864244394 + 864244395.

It is an arithmetic number, because the mean of its divisors is an integer number (864244395).

Almost surely, 2^1728488789 is an apocalyptic number.

It is an amenable number.

1728488789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1728488789 is an equidigital number, since it uses as much as digits as its factorization.

1728488789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14450688, while the sum is 62.

The square root of 1728488789 is about 41575.0981838889. The cubic root of 1728488789 is about 1200.1131349353.

The spelling of 1728488789 in words is "one billion, seven hundred twenty-eight million, four hundred eighty-eight thousand, seven hundred eighty-nine".