6394387680 has 144 divisors (see below), whose sum is σ = 22969411920. Its totient is φ = 1615417344.

The previous prime is 6394387631. The next prime is 6394387691. The reversal of 6394387680 is 867834936.

6394387680 is a `hidden beast` number, since 63 + 9 + 438 + 76 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89497 + ... + 144216.

It is an arithmetic number, because the mean of its divisors is an integer number (159509805).

Almost surely, 2^6394387680 is an apocalyptic number.

6394387680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6394387680 is an abundant number, since it is smaller than the sum of its proper divisors (16575024240).

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

6394387680 is a wasteful number, since it uses less digits than its factorization.

6394387680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233753 (or 233742 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 54.

The square root of 6394387680 is about 79964.9153066518. The cubic root of 6394387680 is about 1856.0926646907.

The spelling of 6394387680 in words is "six billion, three hundred ninety-four million, three hundred eighty-seven thousand, six hundred eighty".