28705568 has 12 divisors (see below), whose sum is σ = 56514150. Its totient is φ = 14352768.

The previous prime is 28705559. The next prime is 28705577. The reversal of 28705568 is 86550782.

It is an interprime number because it is at equal distance from previous prime (28705559) and next prime (28705577).

It can be written as a sum of positive squares in only one way, i.e., 27331984 + 1373584 = 5228^2 + 1172^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448493 + ... + 448556.

Almost surely, 2^28705568 is an apocalyptic number.

It is an amenable number.

28705568 is a deficient number, since it is larger than the sum of its proper divisors (27808582).

28705568 is an equidigital number, since it uses as much as digits as its factorization.

28705568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897059 (or 897051 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 28705568 is about 5357.7577399505. The cubic root of 28705568 is about 306.1883869943.

The spelling of 28705568 in words is "twenty-eight million, seven hundred five thousand, five hundred sixty-eight".