6446601780 has 96 divisors (see below), whose sum is σ = 18460721664. Its totient is φ = 1680129024.

The previous prime is 6446601769. The next prime is 6446601787. The reversal of 6446601780 is 871066446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6446601787) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2911954 + ... + 2914166.

It is an arithmetic number, because the mean of its divisors is an integer number (192299184).

Almost surely, 2^6446601780 is an apocalyptic number.

6446601780 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 6446601780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9230360832).

6446601780 is an abundant number, since it is smaller than the sum of its proper divisors (12014119884).

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

6446601780 is a wasteful number, since it uses less digits than its factorization.

6446601780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3305 (or 3303 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 6446601780 is about 80290.7328400981. The cubic root of 6446601780 is about 1861.1310209822.

The spelling of 6446601780 in words is "six billion, four hundred forty-six million, six hundred one thousand, seven hundred eighty".