6368635440 has 60 divisors (see below), whose sum is σ = 21388003104. Its totient is φ = 1698302592.

The previous prime is 6368635433. The next prime is 6368635459. The reversal of 6368635440 is 445368636.

6368635440 is a `hidden beast` number, since 6 + 3 + 6 + 8 + 635 + 4 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4421944 + ... + 4423383.

Almost surely, 2^6368635440 is an apocalyptic number.

6368635440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6368635440 is an abundant number, since it is smaller than the sum of its proper divisors (15019367664).

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

6368635440 is a wasteful number, since it uses less digits than its factorization.

6368635440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8845346 (or 8845337 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The square root of 6368635440 is about 79803.7307398595. The cubic root of 6368635440 is about 1853.5976197245.

The spelling of 6368635440 in words is "six billion, three hundred sixty-eight million, six hundred thirty-five thousand, four hundred forty".