30040728 has 16 divisors (see below), whose sum is σ = 75101880. Its totient is φ = 10013568.

The previous prime is 30040721. The next prime is 30040757. The reversal of 30040728 is 82704003.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 1251697 = 30040728 / (3 + 0 + 0 + 4 + 0 + 7 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 30040698 and 30040707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30040721) 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 3 ways as a sum of consecutive naturals, for example, 625825 + ... + 625872.

Almost surely, 2^30040728 is an apocalyptic number.

It is an amenable number.

30040728 is an abundant number, since it is smaller than the sum of its proper divisors (45061152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30040728 is a wasteful number, since it uses less digits than its factorization.

30040728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251706 (or 1251702 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 30040728 is about 5480.9422547588. The cubic root of 30040728 is about 310.8637996398.

The spelling of 30040728 in words is "thirty million, forty thousand, seven hundred twenty-eight".