6398634240 has 432 divisors, whose sum is σ = 23245185600. Its totient is φ = 1622949888.

The previous prime is 6398634227. The next prime is 6398634241. The reversal of 6398634240 is 424368936.

6398634240 is a `hidden beast` number, since 6 + 3 + 9 + 8 + 634 + 2 + 4 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (6398634241) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35746471 + ... + 35746649.

It is an arithmetic number, because the mean of its divisors is an integer number (53808300).

Almost surely, 2^6398634240 is an apocalyptic number.

6398634240 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 6398634240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11622592800).

6398634240 is an abundant number, since it is smaller than the sum of its proper divisors (16846551360).

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

6398634240 is a wasteful number, since it uses less digits than its factorization.

6398634240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342 (or 325 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 45.

The square root of 6398634240 is about 79991.4635445558. The cubic root of 6398634240 is about 1856.5034553752.

The spelling of 6398634240 in words is "six billion, three hundred ninety-eight million, six hundred thirty-four thousand, two hundred forty".