724661 has 12 divisors (see below), whose sum is σ = 880992. Its totient is φ = 593208.

The previous prime is 724651. The next prime is 724721. The reversal of 724661 is 166427.

It is not a de Polignac number, because 724661 - 2⁶ = 724597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 724661.

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 724661.

It is not an unprimeable number, because it can be changed into a prime (724601) 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 11 ways as a sum of consecutive naturals, for example, 806 + ... + 1448.

It is an arithmetic number, because the mean of its divisors is an integer number (73416).

2⁷²⁴⁶⁶¹ is an apocalyptic number.

It is an amenable number.

724661 is a deficient number, since it is larger than the sum of its proper divisors (156331).

724661 is a wasteful number, since it uses less digits than its factorization.

724661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680 (or 673 counting only the distinct ones).

The product of its digits is 2016, while the sum is 26.

The square root of 724661 is about 851.2702273661. The cubic root of 724661 is about 89.8210848914.

The spelling of 724661 in words is "seven hundred twenty-four thousand, six hundred sixty-one".