6384890640 has 80 divisors (see below), whose sum is σ = 20275952256. Its totient is φ = 1661107200.

The previous prime is 6384890621. The next prime is 6384890669. The reversal of 6384890640 is 460984836.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 6384890640.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 314596 + ... + 334275.

Almost surely, 2^6384890640 is an apocalyptic number.

6384890640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6384890640 is an abundant number, since it is smaller than the sum of its proper divisors (13891061616).

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

6384890640 is a wasteful number, since it uses less digits than its factorization.

6384890640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648928 (or 648922 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 48.

The square root of 6384890640 is about 79905.5106985745. The cubic root of 6384890640 is about 1855.1733105534.

The spelling of 6384890640 in words is "six billion, three hundred eighty-four million, eight hundred ninety thousand, six hundred forty".