6378876644 has 48 divisors (see below), whose sum is σ = 13077120000. Its totient is φ = 2721414528.

The previous prime is 6378876641. The next prime is 6378876653. The reversal of 6378876644 is 4466788736.

It is not an unprimeable number, because it can be changed into a prime (6378876641) 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, 295532 + ... + 316380.

It is an arithmetic number, because the mean of its divisors is an integer number (272440000).

Almost surely, 2^6378876644 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 6378876644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6538560000).

6378876644 is an abundant number, since it is smaller than the sum of its proper divisors (6698243356).

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

6378876644 is a wasteful number, since it uses less digits than its factorization.

6378876644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21097 (or 21081 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 59.

The square root of 6378876644 is about 79867.8699102461. The cubic root of 6378876644 is about 1854.5906584612.

The spelling of 6378876644 in words is "six billion, three hundred seventy-eight million, eight hundred seventy-six thousand, six hundred forty-four".