1720537680 has 40 divisors (see below), whose sum is σ = 5333667552. Its totient is φ = 458809984.

The previous prime is 1720537667. The next prime is 1720537697. The reversal of 1720537680 is 867350271.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3584214 + ... + 3584693.

Almost surely, 2^1720537680 is an apocalyptic number.

1720537680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1720537680 is an abundant number, since it is smaller than the sum of its proper divisors (3613129872).

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

1720537680 is a wasteful number, since it uses less digits than its factorization.

1720537680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7168923 (or 7168917 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 1720537680 is about 41479.3645081503. The cubic root of 1720537680 is about 1198.2701185679.

The spelling of 1720537680 in words is "one billion, seven hundred twenty million, five hundred thirty-seven thousand, six hundred eighty".