6399632560 has 40 divisors (see below), whose sum is σ = 15359124096. Its totient is φ = 2477276160.

The previous prime is 6399632543. The next prime is 6399632563. The reversal of 6399632560 is 652369936.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (6399632563) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1287769 + ... + 1292728.

Almost surely, 2^6399632560 is an apocalyptic number.

It is an amenable number.

6399632560 is an abundant number, since it is smaller than the sum of its proper divisors (8959491536).

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

6399632560 is a wasteful number, since it uses less digits than its factorization.

6399632560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2580541 (or 2580535 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 49.

The square root of 6399632560 is about 79997.7034670371. The cubic root of 6399632560 is about 1856.6000014026.

The spelling of 6399632560 in words is "six billion, three hundred ninety-nine million, six hundred thirty-two thousand, five hundred sixty".