1728120880 has 40 divisors (see below), whose sum is σ = 4054762800. Its totient is φ = 684903168.

The previous prime is 1728120871. The next prime is 1728120887. The reversal of 1728120880 is 880218271.

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

It is not an unprimeable number, because it can be changed into a prime (1728120887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90370 + ... + 107809.

It is an arithmetic number, because the mean of its divisors is an integer number (101369070).

Almost surely, 2^1728120880 is an apocalyptic number.

1728120880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1728120880 is an abundant number, since it is smaller than the sum of its proper divisors (2326641920).

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

1728120880 is a wasteful number, since it uses less digits than its factorization.

1728120880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198301 (or 198295 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 37.

The square root of 1728120880 is about 41570.6733166544. The cubic root of 1728120880 is about 1200.0279808290.

The spelling of 1728120880 in words is "one billion, seven hundred twenty-eight million, one hundred twenty thousand, eight hundred eighty".