330256721 has 8 divisors (see below), whose sum is σ = 333576360. Its totient is φ = 326950528.

The previous prime is 330256699. The next prime is 330256753. The reversal of 330256721 is 127652033.

It can be written as a sum of positive squares in 4 ways, for example, as 19228225 + 311028496 = 4385^2 + 17636^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-330256721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (335256721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50195 + ... + 56391.

It is an arithmetic number, because the mean of its divisors is an integer number (41697045).

Almost surely, 2^330256721 is an apocalyptic number.

It is an amenable number.

330256721 is a deficient number, since it is larger than the sum of its proper divisors (3319639).

330256721 is a wasteful number, since it uses less digits than its factorization.

330256721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6723.

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 330256721 is about 18172.9667638501. The cubic root of 330256721 is about 691.2214735995.

The spelling of 330256721 in words is "three hundred thirty million, two hundred fifty-six thousand, seven hundred twenty-one".