28038398 has 4 divisors (see below), whose sum is σ = 42057600. Its totient is φ = 14019198.

The previous prime is 28038391. The next prime is 28038401. The reversal of 28038398 is 89383082.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28038391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7009598 + ... + 7009601.

It is an arithmetic number, because the mean of its divisors is an integer number (10514400).

Almost surely, 2^28038398 is an apocalyptic number.

28038398 is a deficient number, since it is larger than the sum of its proper divisors (14019202).

28038398 is a wasteful number, since it uses less digits than its factorization.

28038398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14019201.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 28038398 is about 5295.1296490265. The cubic root of 28038398 is about 303.7976420498.

The spelling of 28038398 in words is "twenty-eight million, thirty-eight thousand, three hundred ninety-eight".