28287423 has 12 divisors (see below), whose sum is σ = 40972360. Its totient is φ = 18806256.

The previous prime is 28287419. The next prime is 28287433. The reversal of 28287423 is 32478282.

It is not a de Polignac number, because 28287423 - 2² = 28287419 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 (28287433) 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 11 ways as a sum of consecutive naturals, for example, 736 + ... + 7557.

Almost surely, 2^28287423 is an apocalyptic number.

28287423 is a deficient number, since it is larger than the sum of its proper divisors (12684937).

28287423 is a wasteful number, since it uses less digits than its factorization.

28287423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8678 (or 8675 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 28287423 is about 5318.5922009494. The cubic root of 28287423 is about 304.6943924437.

The spelling of 28287423 in words is "twenty-eight million, two hundred eighty-seven thousand, four hundred twenty-three".