6399233280 has 720 divisors, whose sum is σ = 25927469568. Its totient is φ = 1492992000.

The previous prime is 6399233273. The next prime is 6399233299. The reversal of 6399233280 is 823329936.

6399233280 is a `hidden beast` number, since 6 + 399 + 233 + 28 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 35354790 + ... + 35354970.

Almost surely, 2^6399233280 is an apocalyptic number.

6399233280 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 6399233280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12963734784).

6399233280 is an abundant number, since it is smaller than the sum of its proper divisors (19528236288).

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

6399233280 is a wasteful number, since it uses less digits than its factorization.

6399233280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The square root of 6399233280 is about 79995.2078564710. The cubic root of 6399233280 is about 1856.5613888386.

The spelling of 6399233280 in words is "six billion, three hundred ninety-nine million, two hundred thirty-three thousand, two hundred eighty".