6398826840 has 384 divisors, whose sum is σ = 25272000000. Its totient is φ = 1371561984.

The previous prime is 6398826767. The next prime is 6398826857. The reversal of 6398826840 is 486288936.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5122536 + ... + 5123784.

It is an arithmetic number, because the mean of its divisors is an integer number (65812500).

Almost surely, 2^6398826840 is an apocalyptic number.

6398826840 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 6398826840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12636000000).

6398826840 is an abundant number, since it is smaller than the sum of its proper divisors (18873173160).

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

6398826840 is a wasteful number, since it uses less digits than its factorization.

6398826840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399 (or 1392 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 54.

The square root of 6398826840 is about 79992.6674139574. The cubic root of 6398826840 is about 1856.5220822136.

The spelling of 6398826840 in words is "six billion, three hundred ninety-eight million, eight hundred twenty-six thousand, eight hundred forty".