6399365280 has 576 divisors, whose sum is σ = 26010077184. Its totient is φ = 1284710400.

The previous prime is 6399365251. The next prime is 6399365299. The reversal of 6399365280 is 825639936.

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, 62129709 + ... + 62129811.

It is an arithmetic number, because the mean of its divisors is an integer number (45156384).

Almost surely, 2^6399365280 is an apocalyptic number.

6399365280 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 6399365280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13005038592).

6399365280 is an abundant number, since it is smaller than the sum of its proper divisors (19610711904).

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

6399365280 is a wasteful number, since it uses less digits than its factorization.

6399365280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 51.

The square root of 6399365280 is about 79996.0329016383. The cubic root of 6399365280 is about 1856.5741541396.

The spelling of 6399365280 in words is "six billion, three hundred ninety-nine million, three hundred sixty-five thousand, two hundred eighty".