1321329328 has 20 divisors (see below), whose sum is σ = 2792810088. Its totient is φ = 600604160.

The previous prime is 1321329287. The next prime is 1321329329. The reversal of 1321329328 is 8239231231.

It is a super-2 number, since 2×1321329328² = 3491822386065863168, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1321329293 and 1321329302.

It is not an unprimeable number, because it can be changed into a prime (1321329329) 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, 3753601 + ... + 3753952.

Almost surely, 2^1321329328 is an apocalyptic number.

It is an amenable number.

1321329328 is an abundant number, since it is smaller than the sum of its proper divisors (1471480760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321329328 is a wasteful number, since it uses less digits than its factorization.

1321329328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7507572 (or 7507566 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 1321329328 is about 36350.0939200987. The cubic root of 1321329328 is about 1097.3294246658.

The spelling of 1321329328 in words is "one billion, three hundred twenty-one million, three hundred twenty-nine thousand, three hundred twenty-eight".