28488671 has 4 divisors (see below), whose sum is σ = 28831992. Its totient is φ = 28145352.

The previous prime is 28488653. The next prime is 28488703. The reversal of 28488671 is 17688482.

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 28488671 - 2²² = 24294367 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 (28488611) 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 3 ways as a sum of consecutive naturals, for example, 171536 + ... + 171701.

It is an arithmetic number, because the mean of its divisors is an integer number (7207998).

Almost surely, 2^28488671 is an apocalyptic number.

28488671 is a deficient number, since it is larger than the sum of its proper divisors (343321).

28488671 is an equidigital number, since it uses as much as digits as its factorization.

28488671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343320.

The product of its digits is 172032, while the sum is 44.

The square root of 28488671 is about 5337.4779624838. The cubic root of 28488671 is about 305.4152580721.

The spelling of 28488671 in words is "twenty-eight million, four hundred eighty-eight thousand, six hundred seventy-one".