28608638 has 8 divisors (see below), whose sum is σ = 43129200. Its totient is φ = 14232240.

The previous prime is 28608607. The next prime is 28608641. The reversal of 28608638 is 83680682.

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

It is a junction number, because it is equal to n+sod(n) for n = 28608595 and 28608604.

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 in 3 ways as a sum of consecutive naturals, for example, 35543 + ... + 36338.

It is an arithmetic number, because the mean of its divisors is an integer number (5391150).

Almost surely, 2^28608638 is an apocalyptic number.

28608638 is a deficient number, since it is larger than the sum of its proper divisors (14520562).

28608638 is a wasteful number, since it uses less digits than its factorization.

28608638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72082.

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 28608638 is about 5348.7043290876. The cubic root of 28608638 is about 305.8433632387.

The spelling of 28608638 in words is "twenty-eight million, six hundred eight thousand, six hundred thirty-eight".