1028469681 has 12 divisors (see below), whose sum is σ = 1486189380. Its totient is φ = 685359360.

The previous prime is 1028469647. The next prime is 1028469691. The reversal of 1028469681 is 1869648201.

1028469681 is a `hidden beast` number, since 102 + 8 + 469 + 6 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 194184225 + 834285456 = 13935^2 + 28884^2 .

It is not a de Polignac number, because 1028469681 - 2¹¹ = 1028467633 is a prime.

It is a super-2 number, since 2×1028469681² = 2115499769472483522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1028469641) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 25 + ... + 45353.

It is an arithmetic number, because the mean of its divisors is an integer number (123849115).

Almost surely, 2^1028469681 is an apocalyptic number.

It is an amenable number.

1028469681 is a deficient number, since it is larger than the sum of its proper divisors (457719699).

1028469681 is a wasteful number, since it uses less digits than its factorization.

1028469681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47856 (or 47853 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 1028469681 is about 32069.7627212925. The cubic root of 1028469681 is about 1009.4012335049.

The spelling of 1028469681 in words is "one billion, twenty-eight million, four hundred sixty-nine thousand, six hundred eighty-one".