726645 has 16 divisors (see below), whose sum is σ = 1173312. Its totient is φ = 384000.

The previous prime is 726641. The next prime is 726647. The reversal of 726645 is 546627.

It is not a de Polignac number, because 726645 - 2² = 726641 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 726645.

It is not an unprimeable number, because it can be changed into a prime (726641) 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 15 ways as a sum of consecutive naturals, for example, 2770 + ... + 3020.

It is an arithmetic number, because the mean of its divisors is an integer number (73332).

2⁷²⁶⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

726645 is a deficient number, since it is larger than the sum of its proper divisors (446667).

726645 is a wasteful number, since it uses less digits than its factorization.

726645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452.

The product of its digits is 10080, while the sum is 30.

The square root of 726645 is about 852.4347482359. The cubic root of 726645 is about 89.9029818738.

Subtracting from 726645 its sum of digits (30), we obtain a triangular number (726615 = T₁₂₀₅).

The spelling of 726645 in words is "seven hundred twenty-six thousand, six hundred forty-five".