28253999 has 4 divisors (see below), whose sum is σ = 28513320. Its totient is φ = 27994680.

The previous prime is 28253987. The next prime is 28254001. The reversal of 28253999 is 99935282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28253999 - 2¹⁶ = 28188463 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 (28258999) 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 3 ways as a sum of consecutive naturals, for example, 129497 + ... + 129714.

It is an arithmetic number, because the mean of its divisors is an integer number (7128330).

Almost surely, 2^28253999 is an apocalyptic number.

28253999 is a deficient number, since it is larger than the sum of its proper divisors (259321).

28253999 is a wasteful number, since it uses less digits than its factorization.

28253999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259320.

The product of its digits is 349920, while the sum is 47.

The square root of 28253999 is about 5315.4490873303. The cubic root of 28253999 is about 304.5743376860.

The spelling of 28253999 in words is "twenty-eight million, two hundred fifty-three thousand, nine hundred ninety-nine".