1328828391 has 12 divisors (see below), whose sum is σ = 2093911560. Its totient is φ = 805350480.

The previous prime is 1328828383. The next prime is 1328828393. The reversal of 1328828391 is 1938288231.

It is a happy number.

1328828391 is a `hidden beast` number, since 1 + 3 + 288 + 283 + 91 = 666.

It is not a de Polignac number, because 1328828391 - 2³ = 1328828383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328828393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6711156 + ... + 6711353.

It is an arithmetic number, because the mean of its divisors is an integer number (174492630).

Almost surely, 2^1328828391 is an apocalyptic number.

1328828391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1328828391 is a deficient number, since it is larger than the sum of its proper divisors (765083169).

1328828391 is a wasteful number, since it uses less digits than its factorization.

1328828391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13422526 (or 13422523 counting only the distinct ones).

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

The square root of 1328828391 is about 36453.0985102776. The cubic root of 1328828391 is about 1099.4014349559.

The spelling of 1328828391 in words is "one billion, three hundred twenty-eight million, eight hundred twenty-eight thousand, three hundred ninety-one".