28047999 has 8 divisors (see below), whose sum is σ = 42739840. Its totient is φ = 16027416.

The previous prime is 28047991. The next prime is 28048001. The reversal of 28047999 is 99974082.

It is a happy number.

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

It is not a de Polignac number, because 28047999 - 2³ = 28047991 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 (28047991) 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, 667789 + ... + 667830.

It is an arithmetic number, because the mean of its divisors is an integer number (5342480).

Almost surely, 2^28047999 is an apocalyptic number.

28047999 is a deficient number, since it is larger than the sum of its proper divisors (14691841).

28047999 is a wasteful number, since it uses less digits than its factorization.

28047999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335629.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 28047999 is about 5296.0361592421. The cubic root of 28047999 is about 303.8323138869.

The spelling of 28047999 in words is "twenty-eight million, forty-seven thousand, nine hundred ninety-nine".