28085128 has 8 divisors (see below), whose sum is σ = 52659630. Its totient is φ = 14042560.

The previous prime is 28085119. The next prime is 28085153. The reversal of 28085128 is 82158082.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15539364 + 12545764 = 3942^2 + 3542^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 28085093 and 28085102.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1755313 + ... + 1755328.

Almost surely, 2^28085128 is an apocalyptic number.

It is an amenable number.

28085128 is a deficient number, since it is larger than the sum of its proper divisors (24574502).

28085128 is a wasteful number, since it uses less digits than its factorization.

28085128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3510647 (or 3510643 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 28085128 is about 5299.5403574272. The cubic root of 28085128 is about 303.9663224466.

The spelling of 28085128 in words is "twenty-eight million, eighty-five thousand, one hundred twenty-eight".