1721330660 has 24 divisors (see below), whose sum is σ = 4131193920. Its totient is φ = 590170464.

The previous prime is 1721330659. The next prime is 1721330683. The reversal of 1721330660 is 660331271.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6147470 + ... + 6147749.

It is an arithmetic number, because the mean of its divisors is an integer number (172133080).

Almost surely, 2^1721330660 is an apocalyptic number.

1721330660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1721330660 is an abundant number, since it is smaller than the sum of its proper divisors (2409863260).

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

1721330660 is a wasteful number, since it uses less digits than its factorization.

1721330660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12295235 (or 12295233 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 1721330660 is about 41488.9221359148. The cubic root of 1721330660 is about 1198.4541808540.

The spelling of 1721330660 in words is "one billion, seven hundred twenty-one million, three hundred thirty thousand, six hundred sixty".