28189779 has 8 divisors (see below), whose sum is σ = 37682640. Its totient is φ = 18745056.

The previous prime is 28189751. The next prime is 28189793. The reversal of 28189779 is 97798182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28189779 - 2¹⁷ = 28058707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28189279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10644 + ... + 13025.

It is an arithmetic number, because the mean of its divisors is an integer number (4710330).

Almost surely, 2^28189779 is an apocalyptic number.

28189779 is a deficient number, since it is larger than the sum of its proper divisors (9492861).

28189779 is a wasteful number, since it uses less digits than its factorization.

28189779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24069.

The product of its digits is 508032, while the sum is 51.

The square root of 28189779 is about 5309.4047688983. The cubic root of 28189779 is about 304.3434016195.

The spelling of 28189779 in words is "twenty-eight million, one hundred eighty-nine thousand, seven hundred seventy-nine".