720755 has 8 divisors (see below), whose sum is σ = 988512. Its totient is φ = 494208.

The previous prime is 720743. The next prime is 720763. The reversal of 720755 is 557027.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 720755 - 2¹⁰ = 719731 is a prime.

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, 10262 + ... + 10331.

It is an arithmetic number, because the mean of its divisors is an integer number (123564).

2⁷²⁰⁷⁵⁵ is an apocalyptic number.

720755 is a deficient number, since it is larger than the sum of its proper divisors (267757).

720755 is a wasteful number, since it uses less digits than its factorization.

720755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20605.

The product of its (nonzero) digits is 2450, while the sum is 26.

The square root of 720755 is about 848.9729088728. The cubic root of 720755 is about 89.6594123258.

The spelling of 720755 in words is "seven hundred twenty thousand, seven hundred fifty-five".