28078764672 has 64 divisors (see below), whose sum is σ = 85239115200. Its totient is φ = 8022503424.

The previous prime is 28078764667. The next prime is 28078764683. The reversal of 28078764672 is 27646787082.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5220297 + ... + 5225672.

It is an arithmetic number, because the mean of its divisors is an integer number (1331861175).

Almost surely, 2^28078764672 is an apocalyptic number.

It is an amenable number.

28078764672 is an abundant number, since it is smaller than the sum of its proper divisors (57160350528).

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

28078764672 is a wasteful number, since it uses less digits than its factorization.

28078764672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10445993 (or 10445981 counting only the distinct ones).

The product of its (nonzero) digits is 12644352, while the sum is 57.

The spelling of 28078764672 in words is "twenty-eight billion, seventy-eight million, seven hundred sixty-four thousand, six hundred seventy-two".