1028266513 has 4 divisors (see below), whose sum is σ = 1032679908. Its totient is φ = 1023853120.

The previous prime is 1028266489. The next prime is 1028266523. The reversal of 1028266513 is 3156628201.

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 514926864 + 513339649 = 22692^2 + 22657^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1028266513 is a prime.

It is a super-3 number, since 3×1028266513³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1028266523) 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 3 ways as a sum of consecutive naturals, for example, 2206348 + ... + 2206813.

It is an arithmetic number, because the mean of its divisors is an integer number (258169977).

Almost surely, 2^1028266513 is an apocalyptic number.

It is an amenable number.

1028266513 is a deficient number, since it is larger than the sum of its proper divisors (4413395).

1028266513 is an equidigital number, since it uses as much as digits as its factorization.

1028266513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4413394.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1028266513 is about 32066.5949704673. The cubic root of 1028266513 is about 1009.3347620801.

The spelling of 1028266513 in words is "one billion, twenty-eight million, two hundred sixty-six thousand, five hundred thirteen".