1028081965 has 4 divisors (see below), whose sum is σ = 1233698364. Its totient is φ = 822465568.

The previous prime is 1028081941. The next prime is 1028081981. The reversal of 1028081965 is 5691808201.

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 430230564 + 597851401 = 20742^2 + 24451^2 .

It is a cyclic number.

It is not a de Polignac number, because 1028081965 - 2²⁵ = 994527533 is a prime.

It is a super-2 number, since 2×1028081965² = 2113905053516522450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102808192 + ... + 102808201.

It is an arithmetic number, because the mean of its divisors is an integer number (308424591).

Almost surely, 2^1028081965 is an apocalyptic number.

It is an amenable number.

1028081965 is a deficient number, since it is larger than the sum of its proper divisors (205616399).

1028081965 is an equidigital number, since it uses as much as digits as its factorization.

1028081965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205616398.

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 1028081965 is about 32063.7172673413. The cubic root of 1028081965 is about 1009.2743750585.

It can be divided in two parts, 102808196 and 5, that added together give a palindrome (102808201).

The spelling of 1028081965 in words is "one billion, twenty-eight million, eighty-one thousand, nine hundred sixty-five".