28281770 has 16 divisors (see below), whose sum is σ = 55535328. Its totient is φ = 10284240.

The previous prime is 28281769. The next prime is 28281779. The reversal of 28281770 is 7718282.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28281770.

It is not an unprimeable number, because it can be changed into a prime (28281779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128444 + ... + 128663.

It is an arithmetic number, because the mean of its divisors is an integer number (3470958).

Almost surely, 2^28281770 is an apocalyptic number.

28281770 is a deficient number, since it is larger than the sum of its proper divisors (27253558).

28281770 is a wasteful number, since it uses less digits than its factorization.

28281770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257125.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 28281770 is about 5318.0607367724. The cubic root of 28281770 is about 304.6740942338.

The spelling of 28281770 in words is "twenty-eight million, two hundred eighty-one thousand, seven hundred seventy".