28549999 has 4 divisors (see below), whose sum is σ = 28587064. Its totient is φ = 28512936.

The previous prime is 28549957. The next prime is 28550057. The reversal of 28549999 is 99994582.

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 28549999 - 2¹¹ = 28547951 is a prime.

It is a Duffinian number.

28549999 is a modest number, since divided by 9999 gives 2854 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28549909) 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, 17352 + ... + 18925.

It is an arithmetic number, because the mean of its divisors is an integer number (7146766).

Almost surely, 2^28549999 is an apocalyptic number.

28549999 is a deficient number, since it is larger than the sum of its proper divisors (37065).

28549999 is an equidigital number, since it uses as much as digits as its factorization.

28549999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37064.

The product of its digits is 2099520, while the sum is 55.

The square root of 28549999 is about 5343.2199093805. The cubic root of 28549999 is about 305.6342583724.

The spelling of 28549999 in words is "twenty-eight million, five hundred forty-nine thousand, nine hundred ninety-nine".