6420555288 has 128 divisors (see below), whose sum is σ = 20445888000. Its totient is φ = 1828759680.

The previous prime is 6420555283. The next prime is 6420555329. The reversal of 6420555288 is 8825550246.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420555283) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 494058 + ... + 506886.

It is an arithmetic number, because the mean of its divisors is an integer number (159733500).

Almost surely, 2^6420555288 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 6420555288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10222944000).

6420555288 is an abundant number, since it is smaller than the sum of its proper divisors (14025332712).

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

6420555288 is a wasteful number, since it uses less digits than its factorization.

6420555288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13182 (or 13172 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 45.

The square root of 6420555288 is about 80128.3675610579. The cubic root of 6420555288 is about 1858.6211008032.

The spelling of 6420555288 in words is "six billion, four hundred twenty million, five hundred fifty-five thousand, two hundred eighty-eight".