28321664782 has 16 divisors (see below), whose sum is σ = 42740338032. Its totient is φ = 14075138880.

The previous prime is 28321664779. The next prime is 28321664843. The reversal of 28321664782 is 28746612382.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161682 + ... + 287722.

It is an arithmetic number, because the mean of its divisors is an integer number (2671271127).

Almost surely, 2^28321664782 is an apocalyptic number.

28321664782 is a deficient number, since it is larger than the sum of its proper divisors (14418673250).

28321664782 is a wasteful number, since it uses less digits than its factorization.

28321664782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126723.

The product of its digits is 1548288, while the sum is 49.

The spelling of 28321664782 in words is "twenty-eight billion, three hundred twenty-one million, six hundred sixty-four thousand, seven hundred eighty-two".