28605866 has 8 divisors (see below), whose sum is σ = 45432900. Its totient is φ = 13461568.

The previous prime is 28605833. The next prime is 28605911. The reversal of 28605866 is 66850682.

It can be written as a sum of positive squares in 2 ways, for example, as 28462225 + 143641 = 5335^2 + 379^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420641 + ... + 420708.

Almost surely, 2^28605866 is an apocalyptic number.

28605866 is a deficient number, since it is larger than the sum of its proper divisors (16827034).

28605866 is a wasteful number, since it uses less digits than its factorization.

28605866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841368.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 28605866 is about 5348.4451946337. The cubic root of 28605866 is about 305.8334848098.

The spelling of 28605866 in words is "twenty-eight million, six hundred five thousand, eight hundred sixty-six".