6899639040 has 648 divisors, whose sum is σ = 29443901760. Its totient is φ = 1482227712.

The previous prime is 6899639011. The next prime is 6899639041. The reversal of 6899639040 is 409369986.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (6899639041) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 9595801 + ... + 9596519.

It is an arithmetic number, because the mean of its divisors is an integer number (45438120).

Almost surely, 2^6899639040 is an apocalyptic number.

6899639040 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 6899639040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14721950880).

6899639040 is an abundant number, since it is smaller than the sum of its proper divisors (22544262720).

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

6899639040 is a wasteful number, since it uses less digits than its factorization.

6899639040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777 (or 753 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The square root of 6899639040 is about 83064.0658768881. The cubic root of 6899639040 is about 1903.7450639061.

The spelling of 6899639040 in words is "six billion, eight hundred ninety-nine million, six hundred thirty-nine thousand, forty".