721080 has 48 divisors (see below), whose sum is σ = 2344680. Its totient is φ = 192192.

The previous prime is 721079. The next prime is 721087. The reversal of 721080 is 80127.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721080.

It is not an unprimeable number, because it can be changed into a prime (721087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 642 + ... + 1361.

2⁷²¹⁰⁸⁰ is an apocalyptic number.

It is an amenable number.

721080 is an abundant number, since it is smaller than the sum of its proper divisors (1623600).

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

721080 is a wasteful number, since it uses less digits than its factorization.

721080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020 (or 2013 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 721080 is about 849.1642950572. The cubic root of 721080 is about 89.6728865902.

The spelling of 721080 in words is "seven hundred twenty-one thousand, eighty".