28147047 has 16 divisors (see below), whose sum is σ = 39184992. Its totient is φ = 17953920.

The previous prime is 28147001. The next prime is 28147073. The reversal of 28147047 is 74074182.

It is not a de Polignac number, because 28147047 - 2¹⁰ = 28146023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28146999 and 28147017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28147447) 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 15 ways as a sum of consecutive naturals, for example, 4693 + ... + 8849.

It is an arithmetic number, because the mean of its divisors is an integer number (2449062).

Almost surely, 2^28147047 is an apocalyptic number.

28147047 is a deficient number, since it is larger than the sum of its proper divisors (11037945).

28147047 is a wasteful number, since it uses less digits than its factorization.

28147047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4258.

The product of its (nonzero) digits is 12544, while the sum is 33.

The square root of 28147047 is about 5305.3790628003. The cubic root of 28147047 is about 304.1895423174.

The spelling of 28147047 in words is "twenty-eight million, one hundred forty-seven thousand, forty-seven".