1028408869 has 2 divisors, whose sum is σ = 1028408870. Its totient is φ = 1028408868.

The previous prime is 1028408861. The next prime is 1028408921. The reversal of 1028408869 is 9688048201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1016780769 + 11628100 = 31887^2 + 3410^2 .

It is a cyclic number.

It is not a de Polignac number, because 1028408869 - 2³ = 1028408861 is a prime.

It is a super-2 number, since 2×1028408869² = 2115249603675718322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1028408861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514204434 + 514204435.

It is an arithmetic number, because the mean of its divisors is an integer number (514204435).

Almost surely, 2^1028408869 is an apocalyptic number.

It is an amenable number.

1028408869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028408869 is an equidigital number, since it uses as much as digits as its factorization.

1028408869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 221184, while the sum is 46.

The square root of 1028408869 is about 32068.8145867601. The cubic root of 1028408869 is about 1009.3813382765.

The spelling of 1028408869 in words is "one billion, twenty-eight million, four hundred eight thousand, eight hundred sixty-nine".