6420276640 has 48 divisors (see below), whose sum is σ = 15172957800. Its totient is φ = 2567255040.

The previous prime is 6420276631. The next prime is 6420276641. The reversal of 6420276640 is 466720246.

It can be written as a sum of positive squares in 4 ways, for example, as 5951813904 + 468462736 = 77148^2 + 21644^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6420276640.

It is not an unprimeable number, because it can be changed into a prime (6420276641) 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, 723430 + ... + 732250.

Almost surely, 2^6420276640 is an apocalyptic number.

It is an amenable number.

6420276640 is an abundant number, since it is smaller than the sum of its proper divisors (8752681160).

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

6420276640 is a wasteful number, since it uses less digits than its factorization.

6420276640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13385 (or 13377 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 37.

The square root of 6420276640 is about 80126.6287821970. The cubic root of 6420276640 is about 1858.5942127579.

Adding to 6420276640 its reverse (466720246), we get a palindrome (6886996886).

The spelling of 6420276640 in words is "six billion, four hundred twenty million, two hundred seventy-six thousand, six hundred forty".