1328135444 has 12 divisors (see below), whose sum is σ = 2325059604. Its totient is φ = 663832704.

The previous prime is 1328135441. The next prime is 1328135477. The reversal of 1328135444 is 4445318231.

It can be written as a sum of positive squares in 2 ways, for example, as 292068100 + 1036067344 = 17090^2 + 32188^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328135441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45719 + ... + 68894.

It is an arithmetic number, because the mean of its divisors is an integer number (193754967).

Almost surely, 2^1328135444 is an apocalyptic number.

It is an amenable number.

1328135444 is a deficient number, since it is larger than the sum of its proper divisors (996924160).

1328135444 is a wasteful number, since it uses less digits than its factorization.

1328135444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117514 (or 117512 counting only the distinct ones).

The product of its digits is 46080, while the sum is 35.

The square root of 1328135444 is about 36443.5926329993. The cubic root of 1328135444 is about 1099.2102993176.

The spelling of 1328135444 in words is "one billion, three hundred twenty-eight million, one hundred thirty-five thousand, four hundred forty-four".