727661 has 8 divisors (see below), whose sum is σ = 804384. Its totient is φ = 652720.

The previous prime is 727633. The next prime is 727667. The reversal of 727661 is 166727.

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-727661 is a prime.

It is a Duffinian number.

It is a Curzon number.

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 727661.

It is not an unprimeable number, because it can be changed into a prime (727667) 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, 515 + ... + 1311.

It is an arithmetic number, because the mean of its divisors is an integer number (100548).

2⁷²⁷⁶⁶¹ is an apocalyptic number.

It is an amenable number.

727661 is a deficient number, since it is larger than the sum of its proper divisors (76723).

727661 is a wasteful number, since it uses less digits than its factorization.

727661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891.

The product of its digits is 3528, while the sum is 29.

The square root of 727661 is about 853.0304801119. The cubic root of 727661 is about 89.9448633479.

It can be divided in two parts, 7276 and 61, that added together give a palindrome (7337).

The spelling of 727661 in words is "seven hundred twenty-seven thousand, six hundred sixty-one".