2105346728 has 8 divisors (see below), whose sum is σ = 3947525130. Its totient is φ = 1052673360.

The previous prime is 2105346721. The next prime is 2105346767. The reversal of 2105346728 is 8276435012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2043220804 + 62125924 = 45202^2 + 7882^2 .

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 = 2105346691 and 2105346700.

It is not an unprimeable number, because it can be changed into a prime (2105346721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131584163 + ... + 131584178.

Almost surely, 2^2105346728 is an apocalyptic number.

It is an amenable number.

2105346728 is a deficient number, since it is larger than the sum of its proper divisors (1842178402).

2105346728 is a wasteful number, since it uses less digits than its factorization.

2105346728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263168347 (or 263168343 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 2105346728 is about 45884.0574491838. The cubic root of 2105346728 is about 1281.6650547972.

The spelling of 2105346728 in words is "two billion, one hundred five million, three hundred forty-six thousand, seven hundred twenty-eight".