6540001280 has 128 divisors (see below), whose sum is σ = 15854227200. Its totient is φ = 2589720576.

The previous prime is 6540001243. The next prime is 6540001283. The reversal of 6540001280 is 821000456.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (6540001283) 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, 29327249 + ... + 29327471.

It is an arithmetic number, because the mean of its divisors is an integer number (123861150).

Almost surely, 2^6540001280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6540001280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7927113600).

6540001280 is an abundant number, since it is smaller than the sum of its proper divisors (9314225920).

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

6540001280 is an equidigital number, since it uses as much as digits as its factorization.

6540001280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437 (or 409 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 6540001280 is about 80870.2743905324. The cubic root of 6540001280 is about 1870.0760909681.

The spelling of 6540001280 in words is "six billion, five hundred forty million, one thousand, two hundred eighty".