1028002805 has 8 divisors (see below), whose sum is σ = 1253826744. Its totient is φ = 808920000.

The previous prime is 1028002793. The next prime is 1028002819. The reversal of 1028002805 is 5082008201.

It can be written as a sum of positive squares in 4 ways, for example, as 16826404 + 1011176401 = 4102^2 + 31799^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1028002805 - 2⁶ = 1028002741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 1684946 + ... + 1685555.

It is an arithmetic number, because the mean of its divisors is an integer number (156728343).

Almost surely, 2^1028002805 is an apocalyptic number.

It is an amenable number.

1028002805 is a deficient number, since it is larger than the sum of its proper divisors (225823939).

1028002805 is an equidigital number, since it uses as much as digits as its factorization.

1028002805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3370567.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 1028002805 is about 32062.4828265061. The cubic root of 1028002805 is about 1009.2484704410.

The spelling of 1028002805 in words is "one billion, twenty-eight million, two thousand, eight hundred five".