661327328 has 24 divisors (see below), whose sum is σ = 1318474080. Its totient is φ = 326476800.

The previous prime is 661327327. The next prime is 661327343. The reversal of 661327328 is 823723166.

661327328 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 661327291 and 661327300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661327327) 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, 128273 + ... + 133328.

It is an arithmetic number, because the mean of its divisors is an integer number (54936420).

Almost surely, 2^661327328 is an apocalyptic number.

It is an amenable number.

661327328 is a deficient number, since it is larger than the sum of its proper divisors (657146752).

661327328 is a wasteful number, since it uses less digits than its factorization.

661327328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261690 (or 261682 counting only the distinct ones).

The product of its digits is 72576, while the sum is 38.

The square root of 661327328 is about 25716.2852682887. The cubic root of 661327328 is about 871.2420397824.

The spelling of 661327328 in words is "six hundred sixty-one million, three hundred twenty-seven thousand, three hundred twenty-eight".