726658 has 4 divisors (see below), whose sum is σ = 1089990. Its totient is φ = 363328.

The previous prime is 726647. The next prime is 726659. The reversal of 726658 is 856627.

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

It can be written as a sum of positive squares in only one way, i.e., 613089 + 113569 = 783^2 + 337^2 .

It is not an unprimeable number, because it can be changed into a prime (726659) by changing a digit.

726658 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 181663 + ... + 181666.

2⁷²⁶⁶⁵⁸ is an apocalyptic number.

726658 is a deficient number, since it is larger than the sum of its proper divisors (363332).

726658 is a wasteful number, since it uses less digits than its factorization.

726658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363331.

The product of its digits is 20160, while the sum is 34.

The square root of 726658 is about 852.4423734189. The cubic root of 726658 is about 89.9035180053.

The spelling of 726658 in words is "seven hundred twenty-six thousand, six hundred fifty-eight".