6449791320 has 256 divisors, whose sum is σ = 24816844800. Its totient is φ = 1459468800.

The previous prime is 6449791297. The next prime is 6449791339. The reversal of 6449791320 is 231979446.

It is a happy number.

6449791320 is a `hidden beast` number, since 6 + 449 + 79 + 132 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 759337 + ... + 767783.

It is an arithmetic number, because the mean of its divisors is an integer number (96940800).

Almost surely, 2^6449791320 is an apocalyptic number.

6449791320 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 6449791320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12408422400).

6449791320 is an abundant number, since it is smaller than the sum of its proper divisors (18367053480).

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

6449791320 is a wasteful number, since it uses less digits than its factorization.

6449791320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8575 (or 8565 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 6449791320 is about 80310.5928256043. The cubic root of 6449791320 is about 1861.4379099609.

The spelling of 6449791320 in words is "six billion, four hundred forty-nine million, seven hundred ninety-one thousand, three hundred twenty".