1328546789 has 4 divisors (see below), whose sum is σ = 1330052256. Its totient is φ = 1327041324.

The previous prime is 1328546761. The next prime is 1328546803. The reversal of 1328546789 is 9876458231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9876458231 = 53857 ⋅183383.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1328546789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1328546789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328546689) 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, 751409 + ... + 753174.

It is an arithmetic number, because the mean of its divisors is an integer number (332513064).

Almost surely, 2^1328546789 is an apocalyptic number.

It is an amenable number.

1328546789 is a deficient number, since it is larger than the sum of its proper divisors (1505467).

1328546789 is an equidigital number, since it uses as much as digits as its factorization.

1328546789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505466.

The product of its digits is 2903040, while the sum is 53.

The square root of 1328546789 is about 36449.2357807403. The cubic root of 1328546789 is about 1099.3237686656.

The spelling of 1328546789 in words is "one billion, three hundred twenty-eight million, five hundred forty-six thousand, seven hundred eighty-nine".