1028136469 has 4 divisors (see below), whose sum is σ = 1038316140. Its totient is φ = 1017956800.

The previous prime is 1028136463. The next prime is 1028136481. The reversal of 1028136469 is 9646318201.

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 1002482244 + 25654225 = 31662^2 + 5065^2 .

It is a cyclic number.

It is not a de Polignac number, because 1028136469 - 2⁹ = 1028135957 is a prime.

It is a super-2 number, since 2×1028136469² = 2114129197775575922, 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 not an unprimeable number, because it can be changed into a prime (1028136463) 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, 5089684 + ... + 5089885.

It is an arithmetic number, because the mean of its divisors is an integer number (259579035).

Almost surely, 2^1028136469 is an apocalyptic number.

It is an amenable number.

1028136469 is a deficient number, since it is larger than the sum of its proper divisors (10179671).

1028136469 is a wasteful number, since it uses less digits than its factorization.

1028136469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10179670.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 1028136469 is about 32064.5671887209. The cubic root of 1028136469 is about 1009.2922103804.

The spelling of 1028136469 in words is "one billion, twenty-eight million, one hundred thirty-six thousand, four hundred sixty-nine".