1128828509 has 18 divisors (see below), whose sum is σ = 1243874970. Its totient is φ = 1022996352.

The previous prime is 1128828499. The next prime is 1128828511. The reversal of 1128828509 is 9058288211.

It can be written as a sum of positive squares in 3 ways, for example, as 468852409 + 659976100 = 21653^2 + 25690^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1128828509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1128828509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128828599) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3075644 + ... + 3076010.

It is an arithmetic number, because the mean of its divisors is an integer number (69104165).

Almost surely, 2^1128828509 is an apocalyptic number.

It is an amenable number.

1128828509 is a deficient number, since it is larger than the sum of its proper divisors (115046461).

1128828509 is an frugal number, since it uses more digits than its factorization.

1128828509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 44.

The square root of 1128828509 is about 33598.0432317122. The cubic root of 1128828509 is about 1041.2203712241.

The spelling of 1128828509 in words is "one billion, one hundred twenty-eight million, eight hundred twenty-eight thousand, five hundred nine".