28287671 has 4 divisors (see below), whose sum is σ = 28605600. Its totient is φ = 27969744.

The previous prime is 28287641. The next prime is 28287703. The reversal of 28287671 is 17678282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17678282 = 2 ⋅8839141.

It is a cyclic number.

It is not a de Polignac number, because 28287671 - 2²² = 24093367 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 (28287641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158831 + ... + 159008.

It is an arithmetic number, because the mean of its divisors is an integer number (7151400).

Almost surely, 2^28287671 is an apocalyptic number.

28287671 is a deficient number, since it is larger than the sum of its proper divisors (317929).

28287671 is an equidigital number, since it uses as much as digits as its factorization.

28287671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317928.

The product of its digits is 75264, while the sum is 41.

The square root of 28287671 is about 5318.6155153386. The cubic root of 28287671 is about 304.6952828746.

The spelling of 28287671 in words is "twenty-eight million, two hundred eighty-seven thousand, six hundred seventy-one".