28728555216 has 40 divisors (see below), whose sum is σ = 74320198560. Its totient is φ = 9562667136.

The previous prime is 28728555209. The next prime is 28728555217. The reversal of 28728555216 is 61255582782.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28728555217) 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, 388050 + ... + 456113.

It is an arithmetic number, because the mean of its divisors is an integer number (1858004964).

Almost surely, 2^28728555216 is an apocalyptic number.

It is an amenable number.

28728555216 is an abundant number, since it is smaller than the sum of its proper divisors (45591643344).

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

28728555216 is a wasteful number, since it uses less digits than its factorization.

28728555216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844883 (or 844877 counting only the distinct ones).

The product of its digits is 2688000, while the sum is 51.

The spelling of 28728555216 in words is "twenty-eight billion, seven hundred twenty-eight million, five hundred fifty-five thousand, two hundred sixteen".