381869664 has 96 divisors (see below), whose sum is σ = 1114331904. Its totient is φ = 113518080.

The previous prime is 381869639. The next prime is 381869669. The reversal of 381869664 is 466968183.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381869669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52557 + ... + 59379.

It is an arithmetic number, because the mean of its divisors is an integer number (11607624).

Almost surely, 2^381869664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381869664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (557165952).

381869664 is an abundant number, since it is smaller than the sum of its proper divisors (732462240).

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

381869664 is a wasteful number, since it uses less digits than its factorization.

381869664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6900 (or 6892 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 51.

The square root of 381869664 is about 19541.4857162909. The cubic root of 381869664 is about 725.5016197195.

The spelling of 381869664 in words is "three hundred eighty-one million, eight hundred sixty-nine thousand, six hundred sixty-four".