28670986 has 16 divisors (see below), whose sum is σ = 44072424. Its totient is φ = 13983424.

The previous prime is 28670953. The next prime is 28670989. The reversal of 28670986 is 68907682.

It can be written as a sum of positive squares in 4 ways, for example, as 24690961 + 3980025 = 4969^2 + 1995^2 .

It is not an unprimeable number, because it can be changed into a prime (28670989) by changing a digit.

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, 20196 + ... + 21568.

Almost surely, 2^28670986 is an apocalyptic number.

28670986 is a deficient number, since it is larger than the sum of its proper divisors (15401438).

28670986 is a wasteful number, since it uses less digits than its factorization.

28670986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 28670986 is about 5354.5294844645. The cubic root of 28670986 is about 306.0653811054.

The spelling of 28670986 in words is "twenty-eight million, six hundred seventy thousand, nine hundred eighty-six".