28533638 has 8 divisors (see below), whose sum is σ = 48914832. Its totient is φ = 12228696.

The previous prime is 28533619. The next prime is 28533641. The reversal of 28533638 is 83633582.

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

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, 1019045 + ... + 1019072.

It is an arithmetic number, because the mean of its divisors is an integer number (6114354).

Almost surely, 2^28533638 is an apocalyptic number.

28533638 is a deficient number, since it is larger than the sum of its proper divisors (20381194).

28533638 is a wasteful number, since it uses less digits than its factorization.

28533638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2038126.

The product of its digits is 103680, while the sum is 38.

The square root of 28533638 is about 5341.6886843020. The cubic root of 28533638 is about 305.5758644695.

The spelling of 28533638 in words is "twenty-eight million, five hundred thirty-three thousand, six hundred thirty-eight".