2164842728 has 8 divisors (see below), whose sum is σ = 4059080130. Its totient is φ = 1082421360.

The previous prime is 2164842709. The next prime is 2164842733. The reversal of 2164842728 is 8272484612.

It can be written as a sum of positive squares in only one way, i.e., 1809821764 + 355020964 = 42542^2 + 18842^2 .

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

It is a super-3 number, since 3×2164842728³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135302663 + ... + 135302678.

Almost surely, 2^2164842728 is an apocalyptic number.

It is an amenable number.

2164842728 is a deficient number, since it is larger than the sum of its proper divisors (1894237402).

2164842728 is a wasteful number, since it uses less digits than its factorization.

2164842728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270605347 (or 270605343 counting only the distinct ones).

The product of its digits is 344064, while the sum is 44.

The square root of 2164842728 is about 46527.8704434235. The cubic root of 2164842728 is about 1293.6261430653.

The spelling of 2164842728 in words is "two billion, one hundred sixty-four million, eight hundred forty-two thousand, seven hundred twenty-eight".