28693189 has 4 divisors (see below), whose sum is σ = 32792224. Its totient is φ = 24594156.

The previous prime is 28693139. The next prime is 28693199. The reversal of 28693189 is 98139682.

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 a cyclic number.

It is not a de Polignac number, because 28693189 - 2¹⁵ = 28660421 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 (28693109) 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, 2049507 + ... + 2049520.

It is an arithmetic number, because the mean of its divisors is an integer number (8198056).

Almost surely, 2^28693189 is an apocalyptic number.

It is an amenable number.

28693189 is a deficient number, since it is larger than the sum of its proper divisors (4099035).

28693189 is an equidigital number, since it uses as much as digits as its factorization.

28693189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4099034.

The product of its digits is 186624, while the sum is 46.

The square root of 28693189 is about 5356.6023746401. The cubic root of 28693189 is about 306.1443670674.

It can be divided in two parts, 28693 and 189, that added together give a palindrome (28882).

The spelling of 28693189 in words is "twenty-eight million, six hundred ninety-three thousand, one hundred eighty-nine".