6396638960 has 40 divisors (see below), whose sum is σ = 15747023376. Its totient is φ = 2408145920.

The previous prime is 6396638957. The next prime is 6396639013. The reversal of 6396638960 is 698366936.

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

It is a junction number, because it is equal to n+sod(n) for n = 6396638896 and 6396638905.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2350346 + ... + 2353065.

Almost surely, 2^6396638960 is an apocalyptic number.

It is an amenable number.

6396638960 is an abundant number, since it is smaller than the sum of its proper divisors (9350384416).

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

6396638960 is a wasteful number, since it uses less digits than its factorization.

6396638960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4703441 (or 4703435 counting only the distinct ones).

The product of its (nonzero) digits is 7558272, while the sum is 56.

The square root of 6396638960 is about 79978.9907413191. The cubic root of 6396638960 is about 1856.3104647477.

The spelling of 6396638960 in words is "six billion, three hundred ninety-six million, six hundred thirty-eight thousand, nine hundred sixty".