30928724 has 6 divisors (see below), whose sum is σ = 54125274. Its totient is φ = 15464360.

The previous prime is 30928717. The next prime is 30928747. The reversal of 30928724 is 42782903.

It can be written as a sum of positive squares in only one way, i.e., 25684624 + 5244100 = 5068^2 + 2290^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3866087 + ... + 3866094.

It is an arithmetic number, because the mean of its divisors is an integer number (9020879).

Almost surely, 2^30928724 is an apocalyptic number.

It is an amenable number.

30928724 is a deficient number, since it is larger than the sum of its proper divisors (23196550).

30928724 is a wasteful number, since it uses less digits than its factorization.

30928724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7732185 (or 7732183 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 30928724 is about 5561.3599056346. The cubic root of 30928724 is about 313.8971223685.

The spelling of 30928724 in words is "thirty million, nine hundred twenty-eight thousand, seven hundred twenty-four".