378021644 has 96 divisors (see below), whose sum is σ = 935155200. Its totient is φ = 128770560.

The previous prime is 378021619. The next prime is 378021649. The reversal of 378021644 is 446120873.

It is not an unprimeable number, because it can be changed into a prime (378021649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73592 + ... + 78560.

It is an arithmetic number, because the mean of its divisors is an integer number (9741200).

Almost surely, 2^378021644 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 378021644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (467577600).

378021644 is an abundant number, since it is smaller than the sum of its proper divisors (557133556).

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

378021644 is a wasteful number, since it uses less digits than its factorization.

378021644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5023 (or 5021 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 378021644 is about 19442.7787108736. The cubic root of 378021644 is about 723.0564792853.

The spelling of 378021644 in words is "three hundred seventy-eight million, twenty-one thousand, six hundred forty-four".