28786630 has 16 divisors (see below), whose sum is σ = 51891840. Its totient is φ = 11497792.

The previous prime is 28786621. The next prime is 28786643. The reversal of 28786630 is 3668782.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6891 + ... + 10249.

It is an arithmetic number, because the mean of its divisors is an integer number (3243240).

Almost surely, 2^28786630 is an apocalyptic number.

28786630 is a deficient number, since it is larger than the sum of its proper divisors (23105210).

28786630 is a wasteful number, since it uses less digits than its factorization.

28786630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4223.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 28786630 is about 5365.3173251915. The cubic root of 28786630 is about 306.4763324807.

The spelling of 28786630 in words is "twenty-eight million, seven hundred eighty-six thousand, six hundred thirty".