28039394 has 8 divisors (see below), whose sum is σ = 42085548. Its totient is φ = 14010880.

The previous prime is 28039393. The next prime is 28039399. The reversal of 28039394 is 49393082.

It can be written as a sum of positive squares in 2 ways, for example, as 27952369 + 87025 = 5287^2 + 295^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28039393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 794 + ... + 7530.

Almost surely, 2^28039394 is an apocalyptic number.

28039394 is a deficient number, since it is larger than the sum of its proper divisors (14046154).

28039394 is a wasteful number, since it uses less digits than its factorization.

28039394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8820.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 28039394 is about 5295.2236968800. The cubic root of 28039394 is about 303.8012392462.

The spelling of 28039394 in words is "twenty-eight million, thirty-nine thousand, three hundred ninety-four".