28347147 has 6 divisors (see below), whose sum is σ = 40945892. Its totient is φ = 18898092.

The previous prime is 28347139. The next prime is 28347173. The reversal of 28347147 is 74174382.

It is a happy number.

It is not a de Polignac number, because 28347147 - 2³ = 28347139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28347197) 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 5 ways as a sum of consecutive naturals, for example, 1574833 + ... + 1574850.

Almost surely, 2^28347147 is an apocalyptic number.

28347147 is a deficient number, since it is larger than the sum of its proper divisors (12598745).

28347147 is a wasteful number, since it uses less digits than its factorization.

28347147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3149689 (or 3149686 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 28347147 is about 5324.2038841502. The cubic root of 28347147 is about 304.9086782047.

The spelling of 28347147 in words is "twenty-eight million, three hundred forty-seven thousand, one hundred forty-seven".