6478339840 has 72 divisors (see below), whose sum is σ = 17734479840. Its totient is φ = 2221142016.

The previous prime is 6478339817. The next prime is 6478339843. The reversal of 6478339840 is 489338746.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6478339843) 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, 352555 + ... + 370474.

It is an arithmetic number, because the mean of its divisors is an integer number (246312220).

Almost surely, 2^6478339840 is an apocalyptic number.

It is an amenable number.

6478339840 is an abundant number, since it is smaller than the sum of its proper divisors (11256140000).

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

6478339840 is an equidigital number, since it uses as much as digits as its factorization.

6478339840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723057 (or 723043 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 52.

The square root of 6478339840 is about 80488.1347777422. The cubic root of 6478339840 is about 1864.1802769145.

The spelling of 6478339840 in words is "six billion, four hundred seventy-eight million, three hundred thirty-nine thousand, eight hundred forty".