30128689 has 8 divisors (see below), whose sum is σ = 31493952. Its totient is φ = 28768080.

The previous prime is 30128677. The next prime is 30128711. The reversal of 30128689 is 98682103.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30128689 - 2⁷ = 30128561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30128669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22842 + ... + 24124.

It is an arithmetic number, because the mean of its divisors is an integer number (3936744).

Almost surely, 2^30128689 is an apocalyptic number.

It is an amenable number.

30128689 is a deficient number, since it is larger than the sum of its proper divisors (1365263).

30128689 is a wasteful number, since it uses less digits than its factorization.

30128689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2327.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 30128689 is about 5488.9606484288. The cubic root of 30128689 is about 311.1669130867.

The spelling of 30128689 in words is "thirty million, one hundred twenty-eight thousand, six hundred eighty-nine".