28067638 has 4 divisors (see below), whose sum is σ = 42101460. Its totient is φ = 14033818.

The previous prime is 28067591. The next prime is 28067647. The reversal of 28067638 is 83676082.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 28067638.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 7016908 + ... + 7016911.

It is an arithmetic number, because the mean of its divisors is an integer number (10525365).

Almost surely, 2^28067638 is an apocalyptic number.

28067638 is a deficient number, since it is larger than the sum of its proper divisors (14033822).

28067638 is a wasteful number, since it uses less digits than its factorization.

28067638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14033821.

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

The square root of 28067638 is about 5297.8899573321. The cubic root of 28067638 is about 303.9032110500.

The spelling of 28067638 in words is "twenty-eight million, sixty-seven thousand, six hundred thirty-eight".