28204705 has 8 divisors (see below), whose sum is σ = 34054272. Its totient is φ = 22424688.

The previous prime is 28204703. The next prime is 28204711. The reversal of 28204705 is 50740282.

28204705 is nontrivially palindromic in base 16.

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

It is a cyclic number.

It is not a de Polignac number, because 28204705 - 2¹ = 28204703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28204703) 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, 16489 + ... + 18118.

It is an arithmetic number, because the mean of its divisors is an integer number (4256784).

Almost surely, 2^28204705 is an apocalyptic number.

It is an amenable number.

28204705 is a deficient number, since it is larger than the sum of its proper divisors (5849567).

28204705 is a wasteful number, since it uses less digits than its factorization.

28204705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34775.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 28204705 is about 5310.8102018430. The cubic root of 28204705 is about 304.3971069962.

Adding to 28204705 its reverse (50740282), we get a palindrome (78944987).

The spelling of 28204705 in words is "twenty-eight million, two hundred four thousand, seven hundred five".