720606 has 16 divisors (see below), whose sum is σ = 1459584. Its totient is φ = 237144.

The previous prime is 720571. The next prime is 720607. The reversal of 720606 is 606027.

720606 is a modest number, since divided by 606 gives 72 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226 + ... + 1221.

It is an arithmetic number, because the mean of its divisors is an integer number (91224).

2⁷²⁰⁶⁰⁶ is an apocalyptic number.

720606 is an abundant number, since it is smaller than the sum of its proper divisors (738978).

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

720606 is a wasteful number, since it uses less digits than its factorization.

720606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 720606 is about 848.8851512425. The cubic root of 720606 is about 89.6532335397.

It can be divided in two parts, 720 and 606, that added together give a triangular number (1326 = T₅₁).

The spelling of 720606 in words is "seven hundred twenty thousand, six hundred six".