6449783976 has 128 divisors (see below), whose sum is σ = 18584640000. Its totient is φ = 2070109440.

The previous prime is 6449783959. The next prime is 6449783981. The reversal of 6449783976 is 6793879446.

6449783976 is a `hidden beast` number, since 64 + 497 + 83 + 9 + 7 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2698590 + ... + 2700978.

It is an arithmetic number, because the mean of its divisors is an integer number (145192500).

Almost surely, 2^6449783976 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 6449783976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9292320000).

6449783976 is an abundant number, since it is smaller than the sum of its proper divisors (12134856024).

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

6449783976 is a wasteful number, since it uses less digits than its factorization.

6449783976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2864 (or 2854 counting only the distinct ones).

The product of its digits is 54867456, while the sum is 63.

The square root of 6449783976 is about 80310.5471031047. The cubic root of 6449783976 is about 1861.4372034572.

The spelling of 6449783976 in words is "six billion, four hundred forty-nine million, seven hundred eighty-three thousand, nine hundred seventy-six".