28639516 has 12 divisors (see below), whose sum is σ = 50514688. Its totient is φ = 14206752.

The previous prime is 28639493. The next prime is 28639529. The reversal of 28639516 is 61593682.

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 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, 27681 + ... + 28696.

Almost surely, 2^28639516 is an apocalyptic number.

It is an amenable number.

28639516 is a deficient number, since it is larger than the sum of its proper divisors (21875172).

28639516 is a wasteful number, since it uses less digits than its factorization.

28639516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56508 (or 56506 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 28639516 is about 5351.5900440897. The cubic root of 28639516 is about 305.9533584058.

The spelling of 28639516 in words is "twenty-eight million, six hundred thirty-nine thousand, five hundred sixteen".