3781020643 has 12 divisors (see below), whose sum is σ = 4037092488. Its totient is φ = 3528732480.

The previous prime is 3781020641. The next prime is 3781020647. The reversal of 3781020643 is 3460201873.

It is a happy number.

It is not a de Polignac number, because 3781020643 - 2¹ = 3781020641 is a prime.

It is a super-2 number, since 2×3781020643² = 28592234205584266898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3781020599 and 3781020608.

It is not an unprimeable number, because it can be changed into a prime (3781020641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2901130 + ... + 2902432.

It is an arithmetic number, because the mean of its divisors is an integer number (336424374).

Almost surely, 2^3781020643 is an apocalyptic number.

3781020643 is a deficient number, since it is larger than the sum of its proper divisors (256071845).

3781020643 is an equidigital number, since it uses as much as digits as its factorization.

3781020643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2754 (or 1451 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 3781020643 is about 61490.0044153519. The cubic root of 3781020643 is about 1557.8884211860. Note that the first 3 decimals are identical.

The spelling of 3781020643 in words is "three billion, seven hundred eighty-one million, twenty thousand, six hundred forty-three".