28078864 has 20 divisors (see below), whose sum is σ = 59348880. Its totient is φ = 12763040.

The previous prime is 28078861. The next prime is 28078907. The reversal of 28078864 is 46887082.

It is a self number, because there is not a number n which added to its sum of digits gives 28078864.

It is not an unprimeable number, because it can be changed into a prime (28078861) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 79594 + ... + 79945.

It is an arithmetic number, because the mean of its divisors is an integer number (2967444).

Almost surely, 2^28078864 is an apocalyptic number.

It is an amenable number.

28078864 is an abundant number, since it is smaller than the sum of its proper divisors (31270016).

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

28078864 is a wasteful number, since it uses less digits than its factorization.

28078864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159558 (or 159552 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 43.

The square root of 28078864 is about 5298.9493298200. The cubic root of 28078864 is about 303.9437222693.

The spelling of 28078864 in words is "twenty-eight million, seventy-eight thousand, eight hundred sixty-four".