6688786220 has 96 divisors (see below), whose sum is σ = 15067852800. Its totient is φ = 2486764800.

The previous prime is 6688786219. The next prime is 6688786249. The reversal of 6688786220 is 226878866.

It is a super-2 number, since 2×6688786220² = 89479722193723776800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5433005 + ... + 5434235.

It is an arithmetic number, because the mean of its divisors is an integer number (156956800).

Almost surely, 2^6688786220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6688786220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7533926400).

6688786220 is an abundant number, since it is smaller than the sum of its proper divisors (8379066580).

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

6688786220 is a wasteful number, since it uses less digits than its factorization.

6688786220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519 (or 1517 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 53.

The square root of 6688786220 is about 81784.9999694320. Note that the first 4 decimals coincide. The cubic root of 6688786220 is about 1884.1512895338.

The spelling of 6688786220 in words is "six billion, six hundred eighty-eight million, seven hundred eighty-six thousand, two hundred twenty".