6420402444 has 48 divisors (see below), whose sum is σ = 15868325088. Its totient is φ = 2013462528.

The previous prime is 6420402433. The next prime is 6420402449. The reversal of 6420402444 is 4442040246.

It is not an unprimeable number, because it can be changed into a prime (6420402449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 749932 + ... + 758444.

It is an arithmetic number, because the mean of its divisors is an integer number (330590106).

Almost surely, 2^6420402444 is an apocalyptic number.

It is an amenable number.

6420402444 is an abundant number, since it is smaller than the sum of its proper divisors (9447922644).

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

6420402444 is a wasteful number, since it uses less digits than its factorization.

6420402444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12234 (or 12232 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 30.

The square root of 6420402444 is about 80127.4138107552. The cubic root of 6420402444 is about 1858.6063522690.

The spelling of 6420402444 in words is "six billion, four hundred twenty million, four hundred two thousand, four hundred forty-four".