28659893 has 4 divisors (see below), whose sum is σ = 28682028. Its totient is φ = 28637760.

The previous prime is 28659889. The next prime is 28659901. The reversal of 28659893 is 39895682.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10876804 + 17783089 = 3298^2 + 4217^2 .

It is a cyclic number.

It is not a de Polignac number, because 28659893 - 2² = 28659889 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 (28659823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8996 + ... + 11757.

It is an arithmetic number, because the mean of its divisors is an integer number (7170507).

Almost surely, 2^28659893 is an apocalyptic number.

It is an amenable number.

28659893 is a deficient number, since it is larger than the sum of its proper divisors (22135).

28659893 is a wasteful number, since it uses less digits than its factorization.

28659893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22134.

The product of its digits is 933120, while the sum is 50.

The square root of 28659893 is about 5353.4935322647. The cubic root of 28659893 is about 306.0259030858.

The spelling of 28659893 in words is "twenty-eight million, six hundred fifty-nine thousand, eight hundred ninety-three".