6390545520 has 80 divisors (see below), whose sum is σ = 19841980032. Its totient is φ = 1701454080.

The previous prime is 6390545509. The next prime is 6390545527. The reversal of 6390545520 is 255450936.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6390545527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133615 + ... + 175025.

Almost surely, 2^6390545520 is an apocalyptic number.

6390545520 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 6390545520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9920990016).

6390545520 is an abundant number, since it is smaller than the sum of its proper divisors (13451434512).

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

6390545520 is a wasteful number, since it uses less digits than its factorization.

6390545520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42070 (or 42064 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 39.

The square root of 6390545520 is about 79940.8876608210. The cubic root of 6390545520 is about 1855.7208368649.

The spelling of 6390545520 in words is "six billion, three hundred ninety million, five hundred forty-five thousand, five hundred twenty".