28006784 has 32 divisors (see below), whose sum is σ = 60090240. Its totient is φ = 12925440.

The previous prime is 28006777. The next prime is 28006789. The reversal of 28006784 is 48760082.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28006789) 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 3 ways as a sum of consecutive naturals, for example, 6752 + ... + 10079.

It is an arithmetic number, because the mean of its divisors is an integer number (1877820).

Almost surely, 2^28006784 is an apocalyptic number.

It is an amenable number.

28006784 is an abundant number, since it is smaller than the sum of its proper divisors (32083456).

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

28006784 is a wasteful number, since it uses less digits than its factorization.

28006784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16858 (or 16846 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 28006784 is about 5292.1436110521. The cubic root of 28006784 is about 303.6834192782.

The spelling of 28006784 in words is "twenty-eight million, six thousand, seven hundred eighty-four".