28214701728 has 48 divisors (see below), whose sum is σ = 74477400480. Its totient is φ = 9352353536.

The previous prime is 28214701693. The next prime is 28214701771. The reversal of 28214701728 is 82710741282.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 28214701728.

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, 803775 + ... + 838142.

It is an arithmetic number, because the mean of its divisors is an integer number (1551612510).

Almost surely, 2^28214701728 is an apocalyptic number.

It is an amenable number.

28214701728 is an abundant number, since it is smaller than the sum of its proper divisors (46262698752).

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

28214701728 is a wasteful number, since it uses less digits than its factorization.

28214701728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642109 (or 1642101 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 42.

The spelling of 28214701728 in words is "twenty-eight billion, two hundred fourteen million, seven hundred one thousand, seven hundred twenty-eight".