6438307904 has 56 divisors (see below), whose sum is σ = 14611746240. Its totient is φ = 2757275136.

The previous prime is 6438307861. The next prime is 6438307907. The reversal of 6438307904 is 4097038346.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is not an unprimeable number, because it can be changed into a prime (6438307907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 728987 + ... + 737765.

It is an arithmetic number, because the mean of its divisors is an integer number (260924040).

Almost surely, 2^6438307904 is an apocalyptic number.

6438307904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

6438307904 is an abundant number, since it is smaller than the sum of its proper divisors (8173438336).

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

6438307904 is a wasteful number, since it uses less digits than its factorization.

6438307904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10435 (or 10425 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 6438307904 is about 80239.0671929827. The cubic root of 6438307904 is about 1860.3325323678.

The spelling of 6438307904 in words is "six billion, four hundred thirty-eight million, three hundred seven thousand, nine hundred four".