720756 has 18 divisors (see below), whose sum is σ = 1822002. Its totient is φ = 240240.

The previous prime is 720743. The next prime is 720763. The reversal of 720756 is 657027.

It can be written as a sum of positive squares in only one way, i.e., 435600 + 285156 = 660^2 + 534^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9975 + ... + 10046.

2⁷²⁰⁷⁵⁶ is an apocalyptic number.

It is an amenable number.

720756 is an abundant number, since it is smaller than the sum of its proper divisors (1101246).

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

720756 is a wasteful number, since it uses less digits than its factorization.

720756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20031 (or 20026 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 720756 is about 848.9734978196. The cubic root of 720756 is about 89.6594537913.

The spelling of 720756 in words is "seven hundred twenty thousand, seven hundred fifty-six".