6778529660 has 72 divisors (see below), whose sum is σ = 16643509344. Its totient is φ = 2312204160.

The previous prime is 6778529599. The next prime is 6778529671. The reversal of 6778529660 is 669258776.

It is a junction number, because it is equal to n+sod(n) for n = 6778529596 and 6778529605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175505 + ... + 210615.

It is an arithmetic number, because the mean of its divisors is an integer number (231159852).

Almost surely, 2^6778529660 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 6778529660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8321754672).

6778529660 is an abundant number, since it is smaller than the sum of its proper divisors (9864979684).

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

6778529660 is a wasteful number, since it uses less digits than its factorization.

6778529660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35331 (or 35322 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 56.

The square root of 6778529660 is about 82331.8265314210. The cubic root of 6778529660 is about 1892.5404337819.

The spelling of 6778529660 in words is "six billion, seven hundred seventy-eight million, five hundred twenty-nine thousand, six hundred sixty".