28639384 has 16 divisors (see below), whose sum is σ = 56525400. Its totient is φ = 13565952.

The previous prime is 28639363. The next prime is 28639411. The reversal of 28639384 is 48393682.

It is a self number, because there is not a number n which added to its sum of digits gives 28639384.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94057 + ... + 94360.

Almost surely, 2^28639384 is an apocalyptic number.

It is an amenable number.

28639384 is a deficient number, since it is larger than the sum of its proper divisors (27886016).

28639384 is a wasteful number, since it uses less digits than its factorization.

28639384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188442 (or 188438 counting only the distinct ones).

The product of its digits is 248832, while the sum is 43.

The square root of 28639384 is about 5351.5777112923. The cubic root of 28639384 is about 305.9528883570.

The spelling of 28639384 in words is "twenty-eight million, six hundred thirty-nine thousand, three hundred eighty-four".