1028597209 has 12 divisors (see below), whose sum is σ = 1068758784. Its totient is φ = 989491832.

The previous prime is 1028597203. The next prime is 1028597287. The reversal of 1028597209 is 9027958201.

It is not a de Polignac number, because 1028597209 - 2⁹ = 1028596697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1028597203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 160464 + ... + 166750.

It is an arithmetic number, because the mean of its divisors is an integer number (89063232).

Almost surely, 2^1028597209 is an apocalyptic number.

It is an amenable number.

1028597209 is a deficient number, since it is larger than the sum of its proper divisors (40161575).

1028597209 is an frugal number, since it uses more digits than its factorization.

1028597209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6452 (or 6393 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 1028597209 is about 32071.7509500183. The cubic root of 1028597209 is about 1009.4429529653.

The spelling of 1028597209 in words is "one billion, twenty-eight million, five hundred ninety-seven thousand, two hundred nine".