6687997910 has 144 divisors (see below), whose sum is σ = 14250869136. Its totient is φ = 2257200000.

The previous prime is 6687997909. The next prime is 6687997919. The reversal of 6687997910 is 197997866.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6687997919) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 26645285 + ... + 26645535.

It is an arithmetic number, because the mean of its divisors is an integer number (98964369).

Almost surely, 2^6687997910 is an apocalyptic number.

6687997910 is an abundant number, since it is smaller than the sum of its proper divisors (7562871226).

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

6687997910 is a wasteful number, since it uses less digits than its factorization.

6687997910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379 (or 349 counting only the distinct ones).

The product of its (nonzero) digits is 10287648, while the sum is 62.

The square root of 6687997910 is about 81780.1804228873. The cubic root of 6687997910 is about 1884.0772674513.

The spelling of 6687997910 in words is "six billion, six hundred eighty-seven million, nine hundred ninety-seven thousand, nine hundred ten".