28443770 has 16 divisors (see below), whose sum is σ = 51324840. Its totient is φ = 11349504.

The previous prime is 28443757. The next prime is 28443773. The reversal of 28443770 is 7734482.

It can be written as a sum of positive squares in 4 ways, for example, as 22972849 + 5470921 = 4793^2 + 2339^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28443770.

It is not an unprimeable number, because it can be changed into a prime (28443773) 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 7 ways as a sum of consecutive naturals, for example, 1046 + ... + 7614.

Almost surely, 2^28443770 is an apocalyptic number.

28443770 is a deficient number, since it is larger than the sum of its proper divisors (22881070).

28443770 is a wasteful number, since it uses less digits than its factorization.

28443770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7009.

The product of its (nonzero) digits is 37632, while the sum is 35.

The square root of 28443770 is about 5333.2701037919. The cubic root of 28443770 is about 305.2547186842.

The spelling of 28443770 in words is "twenty-eight million, four hundred forty-three thousand, seven hundred seventy".