6420839004 has 96 divisors (see below), whose sum is σ = 17688283200. Its totient is φ = 2014214400.

The previous prime is 6420838981. The next prime is 6420839053. The reversal of 6420839004 is 4009380246.

It is a happy number.

6420839004 is a `hidden beast` number, since 64 + 208 + 390 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 6420839004.

It is a congruent number.

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, 524554 + ... + 536654.

It is an arithmetic number, because the mean of its divisors is an integer number (184252950).

Almost surely, 2^6420839004 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 6420839004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8844141600).

6420839004 is an abundant number, since it is smaller than the sum of its proper divisors (11267444196).

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

6420839004 is a wasteful number, since it uses less digits than its factorization.

6420839004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12165 (or 12123 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 6420839004 is about 80130.1379257518. The cubic root of 6420839004 is about 1858.6484770842.

The spelling of 6420839004 in words is "six billion, four hundred twenty million, eight hundred thirty-nine thousand, four".