6400408001280 has 72 divisors (see below), whose sum is σ = 20441303066352. Its totient is φ = 1706775465984.

The previous prime is 6400408001243. The next prime is 6400408001291. The reversal of 6400408001280 is 821008040046.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 833382619 + ... + 833390298.

Almost surely, 2^{6400408001280} is an apocalyptic number.

6400408001280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6400408001280 is an abundant number, since it is smaller than the sum of its proper divisors (14040895065072).

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

6400408001280 is a wasteful number, since it uses less digits than its factorization.

6400408001280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666772941 (or 1666772927 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The spelling of 6400408001280 in words is "six trillion, four hundred billion, four hundred eight million, one thousand, two hundred eighty".