6399378200 has 72 divisors (see below), whose sum is σ = 14973455700. Its totient is φ = 2543523840.

The previous prime is 6399378191. The next prime is 6399378217. The reversal of 6399378200 is 28739936.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7449371 + ... + 7450229.

Almost surely, 2^6399378200 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 6399378200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7486727850).

6399378200 is an abundant number, since it is smaller than the sum of its proper divisors (8574077500).

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

6399378200 is a wasteful number, since it uses less digits than its factorization.

6399378200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261 (or 1059 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 6399378200 is about 79996.1136556020. The cubic root of 6399378200 is about 1856.5754035824.

The spelling of 6399378200 in words is "six billion, three hundred ninety-nine million, three hundred seventy-eight thousand, two hundred".