28124638 has 8 divisors (see below), whose sum is σ = 42273000. Its totient is φ = 14033640.

The previous prime is 28124627. The next prime is 28124687. The reversal of 28124638 is 83642182.

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, 13093 + ... + 15088.

It is an arithmetic number, because the mean of its divisors is an integer number (5284125).

Almost surely, 2^28124638 is an apocalyptic number.

28124638 is a deficient number, since it is larger than the sum of its proper divisors (14148362).

28124638 is a wasteful number, since it uses less digits than its factorization.

28124638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28682.

The product of its digits is 18432, while the sum is 34.

The square root of 28124638 is about 5303.2667291020. The cubic root of 28124638 is about 304.1087950281.

The spelling of 28124638 in words is "twenty-eight million, one hundred twenty-four thousand, six hundred thirty-eight".