6420407128 has 16 divisors (see below), whose sum is σ = 12561666480. Its totient is φ = 3070629408.

The previous prime is 6420407113. The next prime is 6420407131. The reversal of 6420407128 is 8217040246.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 6420407093 and 6420407102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17446575 + ... + 17446942.

It is an arithmetic number, because the mean of its divisors is an integer number (785104155).

Almost surely, 2^6420407128 is an apocalyptic number.

It is an amenable number.

6420407128 is a deficient number, since it is larger than the sum of its proper divisors (6141259352).

6420407128 is a wasteful number, since it uses less digits than its factorization.

6420407128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34893546 (or 34893542 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 6420407128 is about 80127.4430391985. The cubic root of 6420407128 is about 1858.6068042505.

The spelling of 6420407128 in words is "six billion, four hundred twenty million, four hundred seven thousand, one hundred twenty-eight".