2180172728 has 8 divisors (see below), whose sum is σ = 4087823880. Its totient is φ = 1090086360.

The previous prime is 2180172707. The next prime is 2180172733. The reversal of 2180172728 is 8272710812.

2180172728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 2180172691 and 2180172700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136260788 + ... + 136260803.

It is an arithmetic number, because the mean of its divisors is an integer number (510977985).

Almost surely, 2^2180172728 is an apocalyptic number.

It is an amenable number.

2180172728 is a deficient number, since it is larger than the sum of its proper divisors (1907651152).

2180172728 is a wasteful number, since it uses less digits than its factorization.

2180172728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272521597 (or 272521593 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 38.

The square root of 2180172728 is about 46692.3197967289. The cubic root of 2180172728 is about 1296.6725015947.

The spelling of 2180172728 in words is "two billion, one hundred eighty million, one hundred seventy-two thousand, seven hundred twenty-eight".