6420729070 has 32 divisors (see below), whose sum is σ = 13211371008. Its totient is φ = 2200890528.

The previous prime is 6420729019. The next prime is 6420729097. The reversal of 6420729070 is 709270246.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 429949 + ... + 444631.

It is an arithmetic number, because the mean of its divisors is an integer number (412855344).

Almost surely, 2^6420729070 is an apocalyptic number.

6420729070 is an abundant number, since it is smaller than the sum of its proper divisors (6790641938).

6420729070 is a wasteful number, since it uses less digits than its factorization.

6420729070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20944.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 6420729070 is about 80129.4519512021. The cubic root of 6420729070 is about 1858.6378694451.

The spelling of 6420729070 in words is "six billion, four hundred twenty million, seven hundred twenty-nine thousand, seventy".