3881728520 has 16 divisors (see below), whose sum is σ = 8733889260. Its totient is φ = 1552691392.

The previous prime is 3881728517. The next prime is 3881728547. The reversal of 3881728520 is 258271883.

It can be written as a sum of positive squares in 2 ways, for example, as 3752542564 + 129185956 = 61258^2 + 11366^2 .

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 48521567 + ... + 48521646.

Almost surely, 2^3881728520 is an apocalyptic number.

It is an amenable number.

3881728520 is an abundant number, since it is smaller than the sum of its proper divisors (4852160740).

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

3881728520 is a wasteful number, since it uses less digits than its factorization.

3881728520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97043224 (or 97043220 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 44.

The square root of 3881728520 is about 62303.5193227477. The cubic root of 3881728520 is about 1571.5989120187.

The spelling of 3881728520 in words is "three billion, eight hundred eighty-one million, seven hundred twenty-eight thousand, five hundred twenty".