28308671 has 8 divisors (see below), whose sum is σ = 28667520. Its totient is φ = 27952408.

The previous prime is 28308667. The next prime is 28308713. The reversal of 28308671 is 17680382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28308671 - 2² = 28308667 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 (28308571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29420 + ... + 30366.

It is an arithmetic number, because the mean of its divisors is an integer number (3583440).

Almost surely, 2^28308671 is an apocalyptic number.

28308671 is a deficient number, since it is larger than the sum of its proper divisors (358849).

28308671 is a wasteful number, since it uses less digits than its factorization.

28308671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1293.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 28308671 is about 5320.5893470555. The cubic root of 28308671 is about 304.7706633965.

The spelling of 28308671 in words is "twenty-eight million, three hundred eight thousand, six hundred seventy-one".