3864728862728 has 8 divisors (see below), whose sum is σ = 7246366617630. Its totient is φ = 1932364431360.

The previous prime is 3864728862707. The next prime is 3864728862737. The reversal of 3864728862728 is 8272688274683.

It can be written as a sum of positive squares in only one way, i.e., 3822893069284 + 41835793444 = 1955222^2 + 204538^2 .

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

It is a super-2 number, since 2×3864728862728² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 241545553913 + ... + 241545553928.

Almost surely, 2^{3864728862728} is an apocalyptic number.

It is an amenable number.

3864728862728 is a deficient number, since it is larger than the sum of its proper divisors (3381637754902).

3864728862728 is a wasteful number, since it uses less digits than its factorization.

3864728862728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483091107847 (or 483091107843 counting only the distinct ones).

The product of its digits is 693633024, while the sum is 71.

The spelling of 3864728862728 in words is "three trillion, eight hundred sixty-four billion, seven hundred twenty-eight million, eight hundred sixty-two thousand, seven hundred twenty-eight".