6678719640 has 192 divisors, whose sum is σ = 22902328800. Its totient is φ = 1683265536.

The previous prime is 6678719617. The next prime is 6678719647. The reversal of 6678719640 is 469178766.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6678719647) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3809004 + ... + 3810756.

Almost surely, 2^6678719640 is an apocalyptic number.

6678719640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6678719640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11451164400).

6678719640 is an abundant number, since it is smaller than the sum of its proper divisors (16223609160).

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

6678719640 is a wasteful number, since it uses less digits than its factorization.

6678719640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2346 (or 2339 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The square root of 6678719640 is about 81723.4338485602. The cubic root of 6678719640 is about 1883.2056031228.

The spelling of 6678719640 in words is "six billion, six hundred seventy-eight million, seven hundred nineteen thousand, six hundred forty".