28008684 has 36 divisors (see below), whose sum is σ = 77237160. Its totient is φ = 8487360.

The previous prime is 28008683. The next prime is 28008689. The reversal of 28008684 is 48680082.

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28008683) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 34969 + ... + 35760.

Almost surely, 2^28008684 is an apocalyptic number.

It is an amenable number.

28008684 is an abundant number, since it is smaller than the sum of its proper divisors (49228476).

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

28008684 is a wasteful number, since it uses less digits than its factorization.

28008684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70750 (or 70745 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The square root of 28008684 is about 5292.3231193872. The cubic root of 28008684 is about 303.6902864887.

The spelling of 28008684 in words is "twenty-eight million, eight thousand, six hundred eighty-four".