1720646560 has 144 divisors (see below), whose sum is σ = 4402256040. Its totient is φ = 634726400.

The previous prime is 1720646539. The next prime is 1720646561. The reversal of 1720646560 is 656460271.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1616361616 + 104284944 = 40204^2 + 10212^2 .

It is not an unprimeable number, because it can be changed into a prime (1720646561) 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 23 ways as a sum of consecutive naturals, for example, 2454210 + ... + 2454910.

Almost surely, 2^1720646560 is an apocalyptic number.

1720646560 is a gapful number since it is divisible by the number (10) 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 1720646560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2201128020).

1720646560 is an abundant number, since it is smaller than the sum of its proper divisors (2681609480).

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

1720646560 is a wasteful number, since it uses less digits than its factorization.

1720646560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791 (or 760 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 1720646560 is about 41480.6769472245. The cubic root of 1720646560 is about 1198.2953945616.

The spelling of 1720646560 in words is "one billion, seven hundred twenty million, six hundred forty-six thousand, five hundred sixty".