30728030 has 16 divisors (see below), whose sum is σ = 55387584. Its totient is φ = 12274080.

The previous prime is 30728017. The next prime is 30728039. The reversal of 30728030 is 3082703.

It is a junction number, because it is equal to n+sod(n) for n = 30727987 and 30728005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30728039) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 7424 + ... + 10796.

It is an arithmetic number, because the mean of its divisors is an integer number (3461724).

Almost surely, 2^30728030 is an apocalyptic number.

30728030 is a deficient number, since it is larger than the sum of its proper divisors (24659554).

30728030 is a wasteful number, since it uses less digits than its factorization.

30728030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4291.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 30728030 is about 5543.2869310545. The cubic root of 30728030 is about 313.2166974467.

The spelling of 30728030 in words is "thirty million, seven hundred twenty-eight thousand, thirty".