726557 has 4 divisors (see below), whose sum is σ = 782460. Its totient is φ = 670656.

The previous prime is 726533. The next prime is 726559. The reversal of 726557 is 755627.

It is a happy number.

726557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 383161 + 343396 = 619^2 + 586^2 .

It is a cyclic number.

It is not a de Polignac number, because 726557 - 2⁸ = 726301 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

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 726557.

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 3 ways as a sum of consecutive naturals, for example, 27932 + ... + 27957.

It is an arithmetic number, because the mean of its divisors is an integer number (195615).

2⁷²⁶⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

726557 is a deficient number, since it is larger than the sum of its proper divisors (55903).

726557 is a wasteful number, since it uses less digits than its factorization.

726557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55902.

The product of its digits is 14700, while the sum is 32.

The square root of 726557 is about 852.3831298190. The cubic root of 726557 is about 89.8993525079.

The spelling of 726557 in words is "seven hundred twenty-six thousand, five hundred fifty-seven".