1028765905841 has 4 divisors (see below), whose sum is σ = 1029686914932. Its totient is φ = 1027844896752.

The previous prime is 1028765905831. The next prime is 1028765905847. The reversal of 1028765905841 is 1485095678201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25421113600 + 1003344792241 = 159440^2 + 1001671^2 .

It is a cyclic number.

It is not a de Polignac number, because 1028765905841 - 2²⁶ = 1028698796977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1028765905847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460502870 + ... + 460505103.

It is an arithmetic number, because the mean of its divisors is an integer number (257421728733).

Almost surely, 2^{1028765905841} is an apocalyptic number.

It is an amenable number.

1028765905841 is a deficient number, since it is larger than the sum of its proper divisors (921009091).

1028765905841 is an equidigital number, since it uses as much as digits as its factorization.

1028765905841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921009090.

The product of its (nonzero) digits is 4838400, while the sum is 56.

The spelling of 1028765905841 in words is "one trillion, twenty-eight billion, seven hundred sixty-five million, nine hundred five thousand, eight hundred forty-one".