3881651905828 has 12 divisors (see below), whose sum is σ = 6793175307100. Its totient is φ = 1940744675232.

The previous prime is 3881651905819. The next prime is 3881651905843. The reversal of 3881651905828 is 8285091561883.

3881651905828 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 3236717631744 + 644934274084 = 1799088^2 + 803078^2 .

It is a hoax number, since the sum of its digits (64) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 3881651905828.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20211903 + ... + 20403046.

Almost surely, 2^{3881651905828} is an apocalyptic number.

It is an amenable number.

3881651905828 is a deficient number, since it is larger than the sum of its proper divisors (2911523401272).

3881651905828 is a wasteful number, since it uses less digits than its factorization.

3881651905828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40638846 (or 40638844 counting only the distinct ones).

The product of its (nonzero) digits is 33177600, while the sum is 64.

The spelling of 3881651905828 in words is "three trillion, eight hundred eighty-one billion, six hundred fifty-one million, nine hundred five thousand, eight hundred twenty-eight".