28673856 has 84 divisors (see below), whose sum is σ = 83527392. Its totient is φ = 9402624.

The previous prime is 28673851. The next prime is 28673857. The reversal of 28673856 is 65837682.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28673851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38221 + ... + 38963.

Almost surely, 2^28673856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28673856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41763696).

28673856 is an abundant number, since it is smaller than the sum of its proper divisors (54853536).

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

28673856 is a wasteful number, since it uses less digits than its factorization.

28673856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828 (or 815 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 28673856 is about 5354.7974751619. The cubic root of 28673856 is about 306.0755932683.

The spelling of 28673856 in words is "twenty-eight million, six hundred seventy-three thousand, eight hundred fifty-six".