28006544 has 10 divisors (see below), whose sum is σ = 54262710. Its totient is φ = 14003264.

The previous prime is 28006543. The next prime is 28006591. The reversal of 28006544 is 44560082.

It can be written as a sum of positive squares in only one way, i.e., 15840400 + 12166144 = 3980^2 + 3488^2 .

It is not an unprimeable number, because it can be changed into a prime (28006543) 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 as a sum of consecutive naturals, namely, 875189 + ... + 875220.

It is an arithmetic number, because the mean of its divisors is an integer number (5426271).

Almost surely, 2^28006544 is an apocalyptic number.

It is an amenable number.

28006544 is a deficient number, since it is larger than the sum of its proper divisors (26256166).

28006544 is a wasteful number, since it uses less digits than its factorization.

28006544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750417 (or 1750411 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 28006544 is about 5292.1209358819. The cubic root of 28006544 is about 303.6825518189.

The spelling of 28006544 in words is "twenty-eight million, six thousand, five hundred forty-four".