28978205 has 8 divisors (see below), whose sum is σ = 35193312. Its totient is φ = 22902928.

The previous prime is 28978199. The next prime is 28978223. The reversal of 28978205 is 50287982.

It is a happy number.

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 28978205 - 2¹⁰ = 28977181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 34499 + ... + 35328.

It is an arithmetic number, because the mean of its divisors is an integer number (4399164).

Almost surely, 2^28978205 is an apocalyptic number.

It is an amenable number.

28978205 is a deficient number, since it is larger than the sum of its proper divisors (6215107).

28978205 is an equidigital number, since it uses as much as digits as its factorization.

28978205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69915.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 28978205 is about 5383.1408118310. The cubic root of 28978205 is about 307.1546964454.

The spelling of 28978205 in words is "twenty-eight million, nine hundred seventy-eight thousand, two hundred five".