28721173412 has 24 divisors (see below), whose sum is σ = 51368620800. Its totient is φ = 14044867200.

The previous prime is 28721173333. The next prime is 28721173417. The reversal of 28721173412 is 21437112782.

It is not an unprimeable number, because it can be changed into a prime (28721173417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208412 + ... + 317612.

It is an arithmetic number, because the mean of its divisors is an integer number (2140359200).

Almost surely, 2^28721173412 is an apocalyptic number.

It is an amenable number.

28721173412 is a deficient number, since it is larger than the sum of its proper divisors (22647447388).

28721173412 is a wasteful number, since it uses less digits than its factorization.

28721173412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110651 (or 110649 counting only the distinct ones).

The product of its digits is 37632, while the sum is 38.

The spelling of 28721173412 in words is "twenty-eight billion, seven hundred twenty-one million, one hundred seventy-three thousand, four hundred twelve".