30724 has 6 divisors (see below), whose sum is σ = 53774. Its totient is φ = 15360.

The previous prime is 30713. The next prime is 30727. The reversal of 30724 is 42703.

It can be written as a sum of positive squares in only one way, i.e., 28224 + 2500 = 168^2 + 50^2 .

It is a junction number, because it is equal to n+sod(n) for n = 30698 and 30707.

It is not an unprimeable number, because it can be changed into a prime (30727) by changing a digit.

30724 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3837 + ... + 3844.

2³⁰⁷²⁴ is an apocalyptic number.

It is an amenable number.

30724 is a deficient number, since it is larger than the sum of its proper divisors (23050).

30724 is a wasteful number, since it uses less digits than its factorization.

30724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7685 (or 7683 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 16.

The square root of 30724 is about 175.2826289168. The cubic root of 30724 is about 31.3203003994.

The spelling of 30724 in words is "thirty thousand, seven hundred twenty-four".