726569 has 8 divisors (see below), whose sum is σ = 759240. Its totient is φ = 694656.

The previous prime is 726559. The next prime is 726589. The reversal of 726569 is 965627.

It can be written as a sum of positive squares in 4 ways, for example, as 105625 + 620944 = 325^2 + 788^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-726569 is a prime.

It is a super-2 number, since 2×726569² = 1055805023522, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (726559) 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, 2567 + ... + 2835.

It is an arithmetic number, because the mean of its divisors is an integer number (94905).

2⁷²⁶⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

726569 is a deficient number, since it is larger than the sum of its proper divisors (32671).

726569 is a wasteful number, since it uses less digits than its factorization.

726569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379.

The product of its digits is 22680, while the sum is 35.

The square root of 726569 is about 852.3901688781. The cubic root of 726569 is about 89.8998474387.

The spelling of 726569 in words is "seven hundred twenty-six thousand, five hundred sixty-nine".