28638334 has 4 divisors (see below), whose sum is σ = 42957504. Its totient is φ = 14319166.

The previous prime is 28638317. The next prime is 28638359. The reversal of 28638334 is 43383682.

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

It is a junction number, because it is equal to n+sod(n) for n = 28638293 and 28638302.

It is a congruent number.

It is an unprimeable number.

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, 7159582 + ... + 7159585.

It is an arithmetic number, because the mean of its divisors is an integer number (10739376).

Almost surely, 2^28638334 is an apocalyptic number.

28638334 is a deficient number, since it is larger than the sum of its proper divisors (14319170).

28638334 is a wasteful number, since it uses less digits than its factorization.

28638334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14319169.

The product of its digits is 82944, while the sum is 37.

The square root of 28638334 is about 5351.4796084821. The cubic root of 28638334 is about 305.9491492815.

The spelling of 28638334 in words is "twenty-eight million, six hundred thirty-eight thousand, three hundred thirty-four".