28638445 has 8 divisors (see below), whose sum is σ = 37490400. Its totient is φ = 20827920.

The previous prime is 28638439. The next prime is 28638461. The reversal of 28638445 is 54483682.

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

It is not a de Polignac number, because 28638445 - 2³ = 28638437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28638398 and 28638407.

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 in 7 ways as a sum of consecutive naturals, for example, 260295 + ... + 260404.

It is an arithmetic number, because the mean of its divisors is an integer number (4686300).

Almost surely, 2^28638445 is an apocalyptic number.

It is an amenable number.

28638445 is a deficient number, since it is larger than the sum of its proper divisors (8851955).

28638445 is a wasteful number, since it uses less digits than its factorization.

28638445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520715.

The product of its digits is 184320, while the sum is 40.

The square root of 28638445 is about 5351.4899794356. The cubic root of 28638445 is about 305.9495445595.

The spelling of 28638445 in words is "twenty-eight million, six hundred thirty-eight thousand, four hundred forty-five".