726649 has 8 divisors (see below), whose sum is σ = 906048. Its totient is φ = 566160.

The previous prime is 726647. The next prime is 726659. The reversal of 726649 is 946627.

726649 = 252² + 253² + ... + 262².

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

It is not a de Polignac number, because 726649 - 2¹ = 726647 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 4642 + ... + 4795.

It is an arithmetic number, because the mean of its divisors is an integer number (113256).

2⁷²⁶⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

726649 is a deficient number, since it is larger than the sum of its proper divisors (179399).

726649 is a wasteful number, since it uses less digits than its factorization.

726649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9455.

The product of its digits is 18144, while the sum is 34.

The square root of 726649 is about 852.4370944533. The cubic root of 726649 is about 89.9031468380.

Subtracting from 726649 its sum of digits (34), we obtain a triangular number (726615 = T₁₂₀₅).

It can be divided in two parts, 726 and 649, that multiplied together give a palindrome (471174).

The spelling of 726649 in words is "seven hundred twenty-six thousand, six hundred forty-nine".