28724205 has 8 divisors (see below), whose sum is σ = 45958752. Its totient is φ = 15319568.

The previous prime is 28724183. The next prime is 28724207. The reversal of 28724205 is 50242782.

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 28724205 - 2¹⁰ = 28723181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28724207) 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, 957459 + ... + 957488.

It is an arithmetic number, because the mean of its divisors is an integer number (5744844).

Almost surely, 2^28724205 is an apocalyptic number.

It is an amenable number.

28724205 is a deficient number, since it is larger than the sum of its proper divisors (17234547).

28724205 is a wasteful number, since it uses less digits than its factorization.

28724205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914955.

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 28724205 is about 5359.4967114460. The cubic root of 28724205 is about 306.2546366090.

Adding to 28724205 its reverse (50242782), we get a palindrome (78966987).

The spelling of 28724205 in words is "twenty-eight million, seven hundred twenty-four thousand, two hundred five".