720880 has 20 divisors (see below), whose sum is σ = 1676232. Its totient is φ = 288320.

The previous prime is 720877. The next prime is 720887. The reversal of 720880 is 88027.

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

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720887) 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, 4426 + ... + 4585.

2⁷²⁰⁸⁸⁰ is an apocalyptic number.

It is an amenable number.

720880 is an abundant number, since it is smaller than the sum of its proper divisors (955352).

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

720880 is a wasteful number, since it uses less digits than its factorization.

720880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9024 (or 9018 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 720880 is about 849.0465240492. The cubic root of 720880 is about 89.6645952145.

It can be divided in two parts, 720 and 880, that added together give a square (1600 = 40²).

The spelling of 720880 in words is "seven hundred twenty thousand, eight hundred eighty".