28638446 has 4 divisors (see below), whose sum is σ = 42957672. Its totient is φ = 14319222.

The previous prime is 28638439. The next prime is 28638461. The reversal of 28638446 is 64483682.

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

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, 7159610 + ... + 7159613.

It is an arithmetic number, because the mean of its divisors is an integer number (10739418).

Almost surely, 2^28638446 is an apocalyptic number.

28638446 is a deficient number, since it is larger than the sum of its proper divisors (14319226).

28638446 is a wasteful number, since it uses less digits than its factorization.

28638446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14319225.

The product of its digits is 221184, while the sum is 41.

The square root of 28638446 is about 5351.4900728676. The cubic root of 28638446 is about 305.9495481206.

The spelling of 28638446 in words is "twenty-eight million, six hundred thirty-eight thousand, four hundred forty-six".