381644128 has 24 divisors (see below), whose sum is σ = 752870160. Its totient is φ = 190439040.

The previous prime is 381644119. The next prime is 381644141. The reversal of 381644128 is 821446183.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4573 + ... + 28003.

It is an arithmetic number, because the mean of its divisors is an integer number (31369590).

Almost surely, 2^381644128 is an apocalyptic number.

It is an amenable number.

381644128 is a deficient number, since it is larger than the sum of its proper divisors (371226032).

381644128 is a wasteful number, since it uses less digits than its factorization.

381644128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23950 (or 23942 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 381644128 is about 19535.7141666231. The cubic root of 381644128 is about 725.3587621143.

The spelling of 381644128 in words is "three hundred eighty-one million, six hundred forty-four thousand, one hundred twenty-eight".