720181 has 16 divisors (see below), whose sum is σ = 921600. Its totient is φ = 546480.

The previous prime is 720179. The next prime is 720193. The reversal of 720181 is 181027.

It is not a de Polignac number, because 720181 - 2¹ = 720179 is a prime.

It is a super-2 number, since 2×720181² = 1037321345522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3520 + ... + 3718.

It is an arithmetic number, because the mean of its divisors is an integer number (57600).

2⁷²⁰¹⁸¹ is an apocalyptic number.

It is an amenable number.

720181 is a deficient number, since it is larger than the sum of its proper divisors (201419).

720181 is a wasteful number, since it uses less digits than its factorization.

720181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 720181 is about 848.6347859945. The cubic root of 720181 is about 89.6356048043.

The spelling of 720181 in words is "seven hundred twenty thousand, one hundred eighty-one".