6396516420 has 96 divisors (see below), whose sum is σ = 20650146048. Its totient is φ = 1449111552.

The previous prime is 6396516391. The next prime is 6396516439. The reversal of 6396516420 is 246156936.

It is a super-2 number, since 2×6396516420² = 81830844622659232800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19929 + ... + 114848.

It is an arithmetic number, because the mean of its divisors is an integer number (215105688).

Almost surely, 2^6396516420 is an apocalyptic number.

6396516420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6396516420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10325073024).

6396516420 is an abundant number, since it is smaller than the sum of its proper divisors (14253629628).

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

6396516420 is a wasteful number, since it uses less digits than its factorization.

6396516420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134909 (or 134907 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 6396516420 is about 79978.2246614664. The cubic root of 6396516420 is about 1856.2986109321.

It can be divided in two parts, 6396516 and 420, that added together give a palindrome (6396936).

The spelling of 6396516420 in words is "six billion, three hundred ninety-six million, five hundred sixteen thousand, four hundred twenty".