30128047 has 4 divisors (see below), whose sum is σ = 30152176. Its totient is φ = 30103920.

The previous prime is 30128041. The next prime is 30128051. The reversal of 30128047 is 74082103.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 30128047 - 2³ = 30128039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30128041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10083 + ... + 12724.

It is an arithmetic number, because the mean of its divisors is an integer number (7538044).

Almost surely, 2^30128047 is an apocalyptic number.

30128047 is a deficient number, since it is larger than the sum of its proper divisors (24129).

30128047 is a wasteful number, since it uses less digits than its factorization.

30128047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24128.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 30128047 is about 5488.9021671004. The cubic root of 30128047 is about 311.1647028946.

The spelling of 30128047 in words is "thirty million, one hundred twenty-eight thousand, forty-seven".