28067938 has 4 divisors (see below), whose sum is σ = 42101910. Its totient is φ = 14033968.

The previous prime is 28067891. The next prime is 28067939. The reversal of 28067938 is 83976082.

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

It can be written as a sum of positive squares in only one way, i.e., 17783089 + 10284849 = 4217^2 + 3207^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28067894 and 28067903.

It is not an unprimeable number, because it can be changed into a prime (28067939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7016983 + ... + 7016986.

Almost surely, 2^28067938 is an apocalyptic number.

28067938 is a deficient number, since it is larger than the sum of its proper divisors (14033972).

28067938 is a wasteful number, since it uses less digits than its factorization.

28067938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14033971.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 28067938 is about 5297.9182704153. The cubic root of 28067938 is about 303.9042937992.

The spelling of 28067938 in words is "twenty-eight million, sixty-seven thousand, nine hundred thirty-eight".