28085778 has 40 divisors (see below), whose sum is σ = 71926272. Its totient is φ = 8024184.

The previous prime is 28085767. The next prime is 28085791. The reversal of 28085778 is 87758082.

It is a happy number.

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 in 19 ways as a sum of consecutive naturals, for example, 11250 + ... + 13517.

Almost surely, 2^28085778 is an apocalyptic number.

28085778 is an abundant number, since it is smaller than the sum of its proper divisors (43840494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28085778 is a wasteful number, since it uses less digits than its factorization.

28085778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24788 (or 24779 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 45.

The square root of 28085778 is about 5299.6016831456. The cubic root of 28085778 is about 303.9686674194.

The spelling of 28085778 in words is "twenty-eight million, eighty-five thousand, seven hundred seventy-eight".