28939238 has 4 divisors (see below), whose sum is σ = 43408860. Its totient is φ = 14469618.

The previous prime is 28939231. The next prime is 28939259. The reversal of 28939238 is 83293982.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28939231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7234808 + ... + 7234811.

It is an arithmetic number, because the mean of its divisors is an integer number (10852215).

Almost surely, 2^28939238 is an apocalyptic number.

28939238 is a deficient number, since it is larger than the sum of its proper divisors (14469622).

28939238 is a wasteful number, since it uses less digits than its factorization.

28939238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14469621.

The product of its digits is 186624, while the sum is 44.

The square root of 28939238 is about 5379.5202388317. The cubic root of 28939238 is about 307.0169576871.

The spelling of 28939238 in words is "twenty-eight million, nine hundred thirty-nine thousand, two hundred thirty-eight".