1720708056 has 64 divisors (see below), whose sum is σ = 4816310400. Its totient is φ = 569181600.

The previous prime is 1720708019. The next prime is 1720708063. The reversal of 1720708056 is 6508070271.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1720708056.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2110 + ... + 58701.

It is an arithmetic number, because the mean of its divisors is an integer number (75254850).

Almost surely, 2^1720708056 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 1720708056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2408155200).

1720708056 is an abundant number, since it is smaller than the sum of its proper divisors (3095602344).

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

1720708056 is a wasteful number, since it uses less digits than its factorization.

1720708056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60957 (or 60947 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 1720708056 is about 41481.4182014068. The cubic root of 1720708056 is about 1198.3096701053.

The spelling of 1720708056 in words is "one billion, seven hundred twenty million, seven hundred eight thousand, fifty-six".