28387238 has 8 divisors (see below), whose sum is σ = 46451880. Its totient is φ = 12903280.

The previous prime is 28387213. The next prime is 28387243. The reversal of 28387238 is 83278382.

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 = 28387195 and 28387204.

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, 645143 + ... + 645186.

It is an arithmetic number, because the mean of its divisors is an integer number (5806485).

Almost surely, 2^28387238 is an apocalyptic number.

28387238 is a deficient number, since it is larger than the sum of its proper divisors (18064642).

28387238 is a wasteful number, since it uses less digits than its factorization.

28387238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290342.

The product of its digits is 129024, while the sum is 41.

The square root of 28387238 is about 5327.9675299311. The cubic root of 28387238 is about 305.0523532812.

The spelling of 28387238 in words is "twenty-eight million, three hundred eighty-seven thousand, two hundred thirty-eight".