6778448406 has 48 divisors (see below), whose sum is σ = 15208622208. Its totient is φ = 2179641600.

The previous prime is 6778448393. The next prime is 6778448419. The reversal of 6778448406 is 6048448776.

It is an interprime number because it is at equal distance from previous prime (6778448393) and next prime (6778448419).

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, 157726 + ... + 196046.

It is an arithmetic number, because the mean of its divisors is an integer number (316846296).

Almost surely, 2^6778448406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6778448406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7604311104).

6778448406 is an abundant number, since it is smaller than the sum of its proper divisors (8430173802).

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

6778448406 is a wasteful number, since it uses less digits than its factorization.

6778448406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38677 (or 38674 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 54.

The square root of 6778448406 is about 82331.3330755673. Note that the first 3 decimals coincide. The cubic root of 6778448406 is about 1892.5328718128.

The spelling of 6778448406 in words is "six billion, seven hundred seventy-eight million, four hundred forty-eight thousand, four hundred six".