28038394 has 4 divisors (see below), whose sum is σ = 42057594. Its totient is φ = 14019196.

The previous prime is 28038391. The next prime is 28038401. The reversal of 28038394 is 49383082.

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., 28037025 + 1369 = 5295^2 + 37^2 .

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7009597 + ... + 7009600.

Almost surely, 2^28038394 is an apocalyptic number.

28038394 is a deficient number, since it is larger than the sum of its proper divisors (14019200).

28038394 is a wasteful number, since it uses less digits than its factorization.

28038394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14019199.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 28038394 is about 5295.1292713210. The cubic root of 28038394 is about 303.7976276031.

The spelling of 28038394 in words is "twenty-eight million, thirty-eight thousand, three hundred ninety-four".