6420434726 has 4 divisors (see below), whose sum is σ = 9630652092. Its totient is φ = 3210217362.

The previous prime is 6420434717. The next prime is 6420434737. The reversal of 6420434726 is 6274340246.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 6420434726.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1605108680 + ... + 1605108683.

It is an arithmetic number, because the mean of its divisors is an integer number (2407663023).

Almost surely, 2^6420434726 is an apocalyptic number.

6420434726 is a deficient number, since it is larger than the sum of its proper divisors (3210217366).

6420434726 is a wasteful number, since it uses less digits than its factorization.

6420434726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3210217365.

The product of its (nonzero) digits is 193536, while the sum is 38.

The square root of 6420434726 is about 80127.6152521713. The cubic root of 6420434726 is about 1858.6094673089.

The spelling of 6420434726 in words is "six billion, four hundred twenty million, four hundred thirty-four thousand, seven hundred twenty-six".