381021648 has 60 divisors (see below), whose sum is σ = 1145016000. Its totient is φ = 108862656.

The previous prime is 381021647. The next prime is 381021673. The reversal of 381021648 is 846120183.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381021647) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 78648 + ... + 83351.

It is an arithmetic number, because the mean of its divisors is an integer number (19083600).

Almost surely, 2^381021648 is an apocalyptic number.

It is an amenable number.

381021648 is an abundant number, since it is smaller than the sum of its proper divisors (763994352).

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

381021648 is a wasteful number, since it uses less digits than its factorization.

381021648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162024 (or 162011 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 381021648 is about 19519.7758183848. The cubic root of 381021648 is about 724.9641824556.

The spelling of 381021648 in words is "three hundred eighty-one million, twenty-one thousand, six hundred forty-eight".