6445989360 has 120 divisors (see below), whose sum is σ = 21670232064. Its totient is φ = 1717148160.

The previous prime is 6445989359. The next prime is 6445989391. The reversal of 6445989360 is 639895446.

6445989360 is a `hidden beast` number, since 6 + 44 + 598 + 9 + 3 + 6 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a junction number, because it is equal to n+sod(n) for n = 6445989297 and 6445989306.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 782865 + ... + 791055.

Almost surely, 2^6445989360 is an apocalyptic number.

6445989360 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 6445989360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10835116032).

6445989360 is an abundant number, since it is smaller than the sum of its proper divisors (15224242704).

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

6445989360 is a wasteful number, since it uses less digits than its factorization.

6445989360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9303 (or 9294 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The square root of 6445989360 is about 80286.9189843526. The cubic root of 6445989360 is about 1861.0720839901.

The spelling of 6445989360 in words is "six billion, four hundred forty-five million, nine hundred eighty-nine thousand, three hundred sixty".