28666893 has 4 divisors (see below), whose sum is σ = 38222528. Its totient is φ = 19111260.

The previous prime is 28666843. The next prime is 28666903. The reversal of 28666893 is 39866682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28666893 - 2¹⁰ = 28665869 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 (28666843) 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, 4777813 + ... + 4777818.

It is an arithmetic number, because the mean of its divisors is an integer number (9555632).

Almost surely, 2^28666893 is an apocalyptic number.

It is an amenable number.

28666893 is a deficient number, since it is larger than the sum of its proper divisors (9555635).

28666893 is an equidigital number, since it uses as much as digits as its factorization.

28666893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9555634.

The product of its digits is 746496, while the sum is 48.

The square root of 28666893 is about 5354.1472710414. The cubic root of 28666893 is about 306.0508160300.

The spelling of 28666893 in words is "twenty-eight million, six hundred sixty-six thousand, eight hundred ninety-three".