720005 has 32 divisors (see below), whose sum is σ = 1088640. Its totient is φ = 449280.

The previous prime is 719989. The next prime is 720007. The reversal of 720005 is 500027.

It is not a de Polignac number, because 720005 - 2⁴ = 719989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13559 + ... + 13611.

It is an arithmetic number, because the mean of its divisors is an integer number (34020).

2⁷²⁰⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

720005 is a deficient number, since it is larger than the sum of its proper divisors (368635).

720005 is a wasteful number, since it uses less digits than its factorization.

720005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101.

The product of its (nonzero) digits is 70, while the sum is 14.

The square root of 720005 is about 848.5310836970. The cubic root of 720005 is about 89.6283024031.

It can be divided in two parts, 72000 and 5, that multiplied together give a square (360000 = 600²).

The spelling of 720005 in words is "seven hundred twenty thousand, five".