28839994 has 4 divisors (see below), whose sum is σ = 43259994. Its totient is φ = 14419996.

The previous prime is 28839991. The next prime is 28840001. The reversal of 28839994 is 49993882.

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., 25553025 + 3286969 = 5055^2 + 1813^2 .

It is not an unprimeable number, because it can be changed into a prime (28839991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7209997 + ... + 7210000.

Almost surely, 2^28839994 is an apocalyptic number.

28839994 is a deficient number, since it is larger than the sum of its proper divisors (14420000).

28839994 is a wasteful number, since it uses less digits than its factorization.

28839994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14419999.

The product of its digits is 1119744, while the sum is 52.

The square root of 28839994 is about 5370.2880742098. The cubic root of 28839994 is about 306.6655951968.

The spelling of 28839994 in words is "twenty-eight million, eight hundred thirty-nine thousand, nine hundred ninety-four".