28912386 has 16 divisors (see below), whose sum is σ = 58522464. Its totient is φ = 9521184.

The previous prime is 28912381. The next prime is 28912463. The reversal of 28912386 is 68321982.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28912381) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 28531 + ... + 29526.

It is an arithmetic number, because the mean of its divisors is an integer number (3657654).

Almost surely, 2^28912386 is an apocalyptic number.

28912386 is an abundant number, since it is smaller than the sum of its proper divisors (29610078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28912386 is a wasteful number, since it uses less digits than its factorization.

28912386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58145.

The product of its digits is 41472, while the sum is 39.

The square root of 28912386 is about 5377.0238980313. The cubic root of 28912386 is about 306.9219704997.

The spelling of 28912386 in words is "twenty-eight million, nine hundred twelve thousand, three hundred eighty-six".