28239916 has 12 divisors (see below), whose sum is σ = 49557088. Its totient is φ = 14080752.

The previous prime is 28239899. The next prime is 28239971. The reversal of 28239916 is 61993282.

It is a happy number.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8151 + ... + 11086.

Almost surely, 2^28239916 is an apocalyptic number.

It is an amenable number.

28239916 is a deficient number, since it is larger than the sum of its proper divisors (21317172).

28239916 is a wasteful number, since it uses less digits than its factorization.

28239916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19608 (or 19606 counting only the distinct ones).

The product of its digits is 46656, while the sum is 40.

The square root of 28239916 is about 5314.1241987744. The cubic root of 28239916 is about 304.5237249892.

The spelling of 28239916 in words is "twenty-eight million, two hundred thirty-nine thousand, nine hundred sixteen".