660724 has 6 divisors (see below), whose sum is σ = 1156274. Its totient is φ = 330360.

The previous prime is 660719. The next prime is 660727. The reversal of 660724 is 427066.

It can be written as a sum of positive squares in only one way, i.e., 656100 + 4624 = 810^2 + 68^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82587 + ... + 82594.

2⁶⁶⁰⁷²⁴ is an apocalyptic number.

It is an amenable number.

660724 is a deficient number, since it is larger than the sum of its proper divisors (495550).

660724 is a wasteful number, since it uses less digits than its factorization.

660724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165185 (or 165183 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 660724 is about 812.8493095279. The cubic root of 660724 is about 87.0977014872.

The spelling of 660724 in words is "six hundred sixty thousand, seven hundred twenty-four".