6439762680 has 512 divisors, whose sum is σ = 22798540800. Its totient is φ = 1443225600.

The previous prime is 6439762661. The next prime is 6439762697. The reversal of 6439762680 is 862679346.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 105569850 + ... + 105569910.

It is an arithmetic number, because the mean of its divisors is an integer number (44528400).

Almost surely, 2^6439762680 is an apocalyptic number.

6439762680 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 6439762680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11399270400).

6439762680 is an abundant number, since it is smaller than the sum of its proper divisors (16358778120).

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

6439762680 is a wasteful number, since it uses less digits than its factorization.

6439762680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 51.

The square root of 6439762680 is about 80248.1319408745. The cubic root of 6439762680 is about 1860.4726397452.

The spelling of 6439762680 in words is "six billion, four hundred thirty-nine million, seven hundred sixty-two thousand, six hundred eighty".