28257044 has 6 divisors (see below), whose sum is σ = 49449834. Its totient is φ = 14128520.

The previous prime is 28257037. The next prime is 28257067. The reversal of 28257044 is 44075282.

It can be written as a sum of positive squares in only one way, i.e., 24304900 + 3952144 = 4930^2 + 1988^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28257044.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3532127 + ... + 3532134.

It is an arithmetic number, because the mean of its divisors is an integer number (8241639).

Almost surely, 2^28257044 is an apocalyptic number.

It is an amenable number.

28257044 is a deficient number, since it is larger than the sum of its proper divisors (21192790).

28257044 is a wasteful number, since it uses less digits than its factorization.

28257044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7064265 (or 7064263 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 28257044 is about 5315.7355088454. The cubic root of 28257044 is about 304.5852788575.

The spelling of 28257044 in words is "twenty-eight million, two hundred fifty-seven thousand, forty-four".