3781782820 has 24 divisors (see below), whose sum is σ = 8287038144. Its totient is φ = 1446942816.

The previous prime is 3781782731. The next prime is 3781782827. The reversal of 3781782820 is 282871873.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is not an unprimeable number, because it can be changed into a prime (3781782827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4110174 + ... + 4111093.

It is an arithmetic number, because the mean of its divisors is an integer number (345293256).

Almost surely, 2^3781782820 is an apocalyptic number.

It is an amenable number.

3781782820 is an abundant number, since it is smaller than the sum of its proper divisors (4505255324).

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

3781782820 is a wasteful number, since it uses less digits than its factorization.

3781782820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8221299 (or 8221297 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 46.

The square root of 3781782820 is about 61496.2016713228. The cubic root of 3781782820 is about 1557.9930937122.

The spelling of 3781782820 in words is "three billion, seven hundred eighty-one million, seven hundred eighty-two thousand, eight hundred twenty".