28444287 has 8 divisors (see below), whose sum is σ = 37956400. Its totient is φ = 18947520.

The previous prime is 28444279. The next prime is 28444289. The reversal of 28444287 is 78244482.

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

It is not a de Polignac number, because 28444287 - 2³ = 28444279 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 (28444289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1587 + ... + 7707.

It is an arithmetic number, because the mean of its divisors is an integer number (4744550).

Almost surely, 2^28444287 is an apocalyptic number.

28444287 is a deficient number, since it is larger than the sum of its proper divisors (9512113).

28444287 is a wasteful number, since it uses less digits than its factorization.

28444287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7673.

The product of its digits is 114688, while the sum is 39.

The square root of 28444287 is about 5333.3185728962. The cubic root of 28444287 is about 305.2565681312.

The spelling of 28444287 in words is "twenty-eight million, four hundred forty-four thousand, two hundred eighty-seven".