30288728 has 8 divisors (see below), whose sum is σ = 56791380. Its totient is φ = 15144360.

The previous prime is 30288691. The next prime is 30288737. The reversal of 30288728 is 82788203.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 30288691 and 30288700.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1893038 + ... + 1893053.

Almost surely, 2^30288728 is an apocalyptic number.

It is an amenable number.

30288728 is a deficient number, since it is larger than the sum of its proper divisors (26502652).

30288728 is a wasteful number, since it uses less digits than its factorization.

30288728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3786097 (or 3786093 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 30288728 is about 5503.5196011280. The cubic root of 30288728 is about 311.7168974806.

The spelling of 30288728 in words is "thirty million, two hundred eighty-eight thousand, seven hundred twenty-eight".