1721684080 has 20 divisors (see below), whose sum is σ = 4002915672. Its totient is φ = 688673600.

The previous prime is 1721684071. The next prime is 1721684087. The reversal of 1721684080 is 804861271.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721684087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10760446 + ... + 10760605.

Almost surely, 2^1721684080 is an apocalyptic number.

1721684080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1721684080 is an abundant number, since it is smaller than the sum of its proper divisors (2281231592).

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

1721684080 is a wasteful number, since it uses less digits than its factorization.

1721684080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21521064 (or 21521058 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 1721684080 is about 41493.1811265417. The cubic root of 1721684080 is about 1198.5361966072.

The spelling of 1721684080 in words is "one billion, seven hundred twenty-one million, six hundred eighty-four thousand, eighty".