720586 has 4 divisors (see below), whose sum is σ = 1080882. Its totient is φ = 360292.

The previous prime is 720571. The next prime is 720607. The reversal of 720586 is 685027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 685027 = 7 ⋅97861.

It can be written as a sum of positive squares in only one way, i.e., 714025 + 6561 = 845^2 + 81^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 180145 + ... + 180148.

2⁷²⁰⁵⁸⁶ is an apocalyptic number.

720586 is a deficient number, since it is larger than the sum of its proper divisors (360296).

720586 is a wasteful number, since it uses less digits than its factorization.

720586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360295.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 720586 is about 848.8733710042. The cubic root of 720586 is about 89.6524041075.

The spelling of 720586 in words is "seven hundred twenty thousand, five hundred eighty-six".