1765428289 has 3 divisors (see below), whose sum is σ = 1765470307. Its totient is φ = 1765386272.

The previous prime is 1765428283. The next prime is 1765428293. The reversal of 1765428289 is 9828245671.

The square root of 1765428289 is 42017.

It is a perfect power (a square), and thus also a powerful number.

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: 9828245671 = 1373 ⋅7158227.

It can be written as a sum of positive squares in only one way, i.e., 228161025 + 1537267264 = 15105^2 + 39208^2 .

It is not a de Polignac number, because 1765428289 - 2³ = 1765428281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1765428281) 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 2 ways as a sum of consecutive naturals, for example, 21009 + ... + 63025.

Almost surely, 2^1765428289 is an apocalyptic number.

1765428289 is the 42017-th square number.

1765428289 is the 21009-th centered octagonal number.

It is an amenable number.

1765428289 is a deficient number, since it is larger than the sum of its proper divisors (42018).

1765428289 is an frugal number, since it uses more digits than its factorization.

1765428289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84034 (or 42017 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 52.

The cubic root of 1765428289 is about 1208.6021443686.

The spelling of 1765428289 in words is "one billion, seven hundred sixty-five million, four hundred twenty-eight thousand, two hundred eighty-nine".