6420729069 has 12 divisors (see below), whose sum is σ = 9345184992. Its totient is φ = 4247809800.

The previous prime is 6420729019. The next prime is 6420729097. The reversal of 6420729069 is 9609270246.

It is not a de Polignac number, because 6420729069 - 2²¹ = 6418631917 is a prime.

It is a super-2 number, since 2×6420729069² = 82451523555003213522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420729019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2721777 + ... + 2724134.

It is an arithmetic number, because the mean of its divisors is an integer number (778765416).

Almost surely, 2^6420729069 is an apocalyptic number.

It is an amenable number.

6420729069 is a deficient number, since it is larger than the sum of its proper divisors (2924455923).

6420729069 is a wasteful number, since it uses less digits than its factorization.

6420729069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5446048 (or 5446045 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 6420729069 is about 80129.4519449622. The cubic root of 6420729069 is about 1858.6378693487.

The spelling of 6420729069 in words is "six billion, four hundred twenty million, seven hundred twenty-nine thousand, sixty-nine".