1720289664 has 160 divisors (see below), whose sum is σ = 5146614000. Its totient is φ = 570405888.

The previous prime is 1720289651. The next prime is 1720289699. The reversal of 1720289664 is 4669820271.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2871637 + ... + 2872235.

Almost surely, 2^1720289664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1720289664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2573307000).

1720289664 is an abundant number, since it is smaller than the sum of its proper divisors (3426324336).

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

1720289664 is an equidigital number, since it uses as much as digits as its factorization.

1720289664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902 (or 881 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 1720289664 is about 41476.3747692587. The cubic root of 1720289664 is about 1198.2125388074.

The spelling of 1720289664 in words is "one billion, seven hundred twenty million, two hundred eighty-nine thousand, six hundred sixty-four".