6397635920 has 80 divisors (see below), whose sum is σ = 16861837440. Its totient is φ = 2237870592.

The previous prime is 6397635919. The next prime is 6397635931. The reversal of 6397635920 is 295367936.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142124 + ... + 181643.

It is an arithmetic number, because the mean of its divisors is an integer number (210772968).

Almost surely, 2^6397635920 is an apocalyptic number.

It is an amenable number.

6397635920 is an abundant number, since it is smaller than the sum of its proper divisors (10464201520).

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

6397635920 is a wasteful number, since it uses less digits than its factorization.

6397635920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323812 (or 323806 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 50.

The square root of 6397635920 is about 79985.2231352767. The cubic root of 6397635920 is about 1856.4068993052.

The spelling of 6397635920 in words is "six billion, three hundred ninety-seven million, six hundred thirty-five thousand, nine hundred twenty".