28022638 has 8 divisors (see below), whose sum is σ = 48038832. Its totient is φ = 12009696.

The previous prime is 28022623. The next prime is 28022651. The reversal of 28022638 is 83622082.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1000795 + ... + 1000822.

It is an arithmetic number, because the mean of its divisors is an integer number (6004854).

Almost surely, 2^28022638 is an apocalyptic number.

28022638 is a deficient number, since it is larger than the sum of its proper divisors (20016194).

28022638 is a wasteful number, since it uses less digits than its factorization.

28022638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001626.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 28022638 is about 5293.6412798753. The cubic root of 28022638 is about 303.7407112154.

The spelling of 28022638 in words is "twenty-eight million, twenty-two thousand, six hundred thirty-eight".