6381918780 has 96 divisors (see below), whose sum is σ = 18154160640. Its totient is φ = 1674812160.

The previous prime is 6381918761. The next prime is 6381918787. The reversal of 6381918780 is 878191836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6381918787) 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 31 ways as a sum of consecutive naturals, for example, 3223831 + ... + 3225809.

It is an arithmetic number, because the mean of its divisors is an integer number (189105840).

Almost surely, 2^6381918780 is an apocalyptic number.

6381918780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6381918780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9077080320).

6381918780 is an abundant number, since it is smaller than the sum of its proper divisors (11772241860).

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

6381918780 is a wasteful number, since it uses less digits than its factorization.

6381918780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2819 (or 2817 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 51.

The square root of 6381918780 is about 79886.9124450307. The cubic root of 6381918780 is about 1854.8854345202.

The spelling of 6381918780 in words is "six billion, three hundred eighty-one million, nine hundred eighteen thousand, seven hundred eighty".