28617986 has 8 divisors (see below), whose sum is σ = 43737084. Its totient is φ = 14038960.

The previous prime is 28617977. The next prime is 28617997. The reversal of 28617986 is 68971682.

It can be written as a sum of positive squares in 2 ways, for example, as 27762361 + 855625 = 5269^2 + 925^2 .

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28617986.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134885 + ... + 135096.

Almost surely, 2^28617986 is an apocalyptic number.

28617986 is a deficient number, since it is larger than the sum of its proper divisors (15119098).

28617986 is a wasteful number, since it uses less digits than its factorization.

28617986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270036.

The product of its digits is 290304, while the sum is 47.

The square root of 28617986 is about 5349.5781142068. The cubic root of 28617986 is about 305.8766715052.

The spelling of 28617986 in words is "twenty-eight million, six hundred seventeen thousand, nine hundred eighty-six".