1721103680 has 56 divisors (see below), whose sum is σ = 4108216320. Its totient is φ = 686789120.

The previous prime is 1721103677. The next prime is 1721103697. The reversal of 1721103680 is 863011271.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131681 + ... + 144159.

Almost surely, 2^1721103680 is an apocalyptic number.

1721103680 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 1721103680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2054108160).

1721103680 is an abundant number, since it is smaller than the sum of its proper divisors (2387112640).

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

1721103680 is a wasteful number, since it uses less digits than its factorization.

1721103680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12927 (or 12917 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1721103680 is about 41486.1866167523. The cubic root of 1721103680 is about 1198.4015012432.

The spelling of 1721103680 in words is "one billion, seven hundred twenty-one million, one hundred three thousand, six hundred eighty".