1720617881472 has 384 divisors, whose sum is σ = 5804340534720. Its totient is φ = 478973952000.

The previous prime is 1720617881471. The next prime is 1720617881527. The reversal of 1720617881472 is 2741887160271.

It is a happy number.

1720617881472 is a `hidden beast` number, since 1 + 7 + 2 + 0 + 617 + 8 + 8 + 14 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720617881471) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 282019222 + ... + 282025322.

Almost surely, 2^{1720617881472} is an apocalyptic number.

1720617881472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1720617881472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2902170267360).

1720617881472 is an abundant number, since it is smaller than the sum of its proper divisors (4083722653248).

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

1720617881472 is a wasteful number, since it uses less digits than its factorization.

1720617881472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7022 (or 7007 counting only the distinct ones).

The product of its (nonzero) digits is 2107392, while the sum is 54.

The spelling of 1720617881472 in words is "one trillion, seven hundred twenty billion, six hundred seventeen million, eight hundred eighty-one thousand, four hundred seventy-two".