28393838 has 8 divisors (see below), whose sum is σ = 46462680. Its totient is φ = 12906280.

The previous prime is 28393831. The next prime is 28393843. The reversal of 28393838 is 83839382.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28393831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645293 + ... + 645336.

It is an arithmetic number, because the mean of its divisors is an integer number (5807835).

Almost surely, 2^28393838 is an apocalyptic number.

28393838 is a deficient number, since it is larger than the sum of its proper divisors (18068842).

28393838 is a wasteful number, since it uses less digits than its factorization.

28393838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290642.

The product of its digits is 248832, while the sum is 44.

The square root of 28393838 is about 5328.5868670784. The cubic root of 28393838 is about 305.0759928890.

The spelling of 28393838 in words is "twenty-eight million, three hundred ninety-three thousand, eight hundred thirty-eight".