28721166616 has 16 divisors (see below), whose sum is σ = 54501010200. Its totient is φ = 14187563904.

The previous prime is 28721166611. The next prime is 28721166641. The reversal of 28721166616 is 61666112782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28721166611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21626721 + ... + 21628048.

Almost surely, 2^28721166616 is an apocalyptic number.

It is an amenable number.

28721166616 is a deficient number, since it is larger than the sum of its proper divisors (25779843584).

28721166616 is a wasteful number, since it uses less digits than its factorization.

28721166616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43254858 (or 43254854 counting only the distinct ones).

The product of its digits is 290304, while the sum is 46.

The spelling of 28721166616 in words is "twenty-eight billion, seven hundred twenty-one million, one hundred sixty-six thousand, six hundred sixteen".