28107238 has 4 divisors (see below), whose sum is σ = 42160860. Its totient is φ = 14053618.

The previous prime is 28107227. The next prime is 28107253. The reversal of 28107238 is 83270182.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7026808 + ... + 7026811.

It is an arithmetic number, because the mean of its divisors is an integer number (10540215).

Almost surely, 2^28107238 is an apocalyptic number.

28107238 is a deficient number, since it is larger than the sum of its proper divisors (14053622).

28107238 is a wasteful number, since it uses less digits than its factorization.

28107238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14053621.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 28107238 is about 5301.6259769999. The cubic root of 28107238 is about 304.0460672916.

The spelling of 28107238 in words is "twenty-eight million, one hundred seven thousand, two hundred thirty-eight".