28685628 has 36 divisors (see below), whose sum is σ = 72709728. Its totient is φ = 9535680.

The previous prime is 28685599. The next prime is 28685653. The reversal of 28685628 is 82658682.

28685628 is a `hidden beast` number, since 2 + 86 + 8 + 562 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15808 + ... + 17528.

Almost surely, 2^28685628 is an apocalyptic number.

It is an amenable number.

28685628 is an abundant number, since it is smaller than the sum of its proper divisors (44024100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28685628 is a wasteful number, since it uses less digits than its factorization.

28685628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2194 (or 2189 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The square root of 28685628 is about 5355.8965636017. The cubic root of 28685628 is about 306.1174737989.

The spelling of 28685628 in words is "twenty-eight million, six hundred eighty-five thousand, six hundred twenty-eight".