6689455760 has 80 divisors (see below), whose sum is σ = 16881586176. Its totient is φ = 2450456064.

The previous prime is 6689455757. The next prime is 6689455793. The reversal of 6689455760 is 675549866.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 6689455696 and 6689455705.

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, 106757 + ... + 157403.

Almost surely, 2^6689455760 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 6689455760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8440793088).

6689455760 is an abundant number, since it is smaller than the sum of its proper divisors (10192130416).

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

6689455760 is a wasteful number, since it uses less digits than its factorization.

6689455760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50800 (or 50794 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 56.

The square root of 6689455760 is about 81789.0931603964. The cubic root of 6689455760 is about 1884.2141545800.

The spelling of 6689455760 in words is "six billion, six hundred eighty-nine million, four hundred fifty-five thousand, seven hundred sixty".