6459987940 has 96 divisors (see below), whose sum is σ = 15795166464. Its totient is φ = 2173616640.

The previous prime is 6459987931. The next prime is 6459987959. The reversal of 6459987940 is 497899546.

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, 1822570 + ... + 1826110.

It is an arithmetic number, because the mean of its divisors is an integer number (164532984).

Almost surely, 2^6459987940 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 6459987940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7897583232).

6459987940 is an abundant number, since it is smaller than the sum of its proper divisors (9335178524).

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

6459987940 is a wasteful number, since it uses less digits than its factorization.

6459987940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3797 (or 3795 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 61.

The square root of 6459987940 is about 80374.0501654607. The cubic root of 6459987940 is about 1862.4183231603.

The spelling of 6459987940 in words is "six billion, four hundred fifty-nine million, nine hundred eighty-seven thousand, nine hundred forty".