28148147 has 4 divisors (see below), whose sum is σ = 28182000. Its totient is φ = 28114296.

The previous prime is 28148137. The next prime is 28148161. The reversal of 28148147 is 74184182.

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 28148147 - 2¹⁰ = 28147123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28148117) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 15647 + ... + 17352.

It is an arithmetic number, because the mean of its divisors is an integer number (7045500).

Almost surely, 2^28148147 is an apocalyptic number.

28148147 is a deficient number, since it is larger than the sum of its proper divisors (33853).

28148147 is an equidigital number, since it uses as much as digits as its factorization.

28148147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33852.

The product of its digits is 14336, while the sum is 35.

The square root of 28148147 is about 5305.4827301575. The cubic root of 28148147 is about 304.1935048898.

The spelling of 28148147 in words is "twenty-eight million, one hundred forty-eight thousand, one hundred forty-seven".