28105772 has 6 divisors (see below), whose sum is σ = 49185108. Its totient is φ = 14052884.

The previous prime is 28105739. The next prime is 28105783. The reversal of 28105772 is 27750182.

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, 3513218 + ... + 3513225.

It is an arithmetic number, because the mean of its divisors is an integer number (8197518).

Almost surely, 2^28105772 is an apocalyptic number.

It is an amenable number.

28105772 is a deficient number, since it is larger than the sum of its proper divisors (21079336).

28105772 is a wasteful number, since it uses less digits than its factorization.

28105772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7026447 (or 7026445 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 28105772 is about 5301.4877157266. The cubic root of 28105772 is about 304.0407811172.

The spelling of 28105772 in words is "twenty-eight million, one hundred five thousand, seven hundred seventy-two".