3828781621 has 8 divisors (see below), whose sum is σ = 4376746304. Its totient is φ = 3281065920.

The previous prime is 3828781603. The next prime is 3828781657. The reversal of 3828781621 is 1261878283.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3828781621 - 2⁷ = 3828781493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3828781661) 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, 28035 + ... + 91888.

It is an arithmetic number, because the mean of its divisors is an integer number (547093288).

Almost surely, 2^3828781621 is an apocalyptic number.

It is an amenable number.

3828781621 is a deficient number, since it is larger than the sum of its proper divisors (547964683).

3828781621 is a wasteful number, since it uses less digits than its factorization.

3828781621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124491.

The product of its digits is 258048, while the sum is 46.

The square root of 3828781621 is about 61877.1494252927. The cubic root of 3828781621 is about 1564.4206221945.

The spelling of 3828781621 in words is "three billion, eight hundred twenty-eight million, seven hundred eighty-one thousand, six hundred twenty-one".