28080238 has 4 divisors (see below), whose sum is σ = 42120360. Its totient is φ = 14040118.

The previous prime is 28080229. The next prime is 28080257. The reversal of 28080238 is 83208082.

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

It is a super-2 number, since 2×28080238² = 1576999532273288, which contains 22 as substring.

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, 7020058 + ... + 7020061.

It is an arithmetic number, because the mean of its divisors is an integer number (10530090).

Almost surely, 2^28080238 is an apocalyptic number.

28080238 is a deficient number, since it is larger than the sum of its proper divisors (14040122).

28080238 is a wasteful number, since it uses less digits than its factorization.

28080238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14040121.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 28080238 is about 5299.0789765770. The cubic root of 28080238 is about 303.9486798756.

The spelling of 28080238 in words is "twenty-eight million, eighty thousand, two hundred thirty-eight".