6420732064 has 24 divisors (see below), whose sum is σ = 12879325620. Its totient is φ = 3149792256.

The previous prime is 6420732047. The next prime is 6420732067. The reversal of 6420732064 is 4602370246.

It can be written as a sum of positive squares in 2 ways, for example, as 6396800400 + 23931664 = 79980^2 + 4892^2 .

It is not an unprimeable number, because it can be changed into a prime (6420732067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1891209 + ... + 1894600.

Almost surely, 2^6420732064 is an apocalyptic number.

It is an amenable number.

6420732064 is an abundant number, since it is smaller than the sum of its proper divisors (6458593556).

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

6420732064 is a wasteful number, since it uses less digits than its factorization.

6420732064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3785872 (or 3785864 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 34.

The square root of 6420732064 is about 80129.4706334692. The cubic root of 6420732064 is about 1858.6381583407.

The spelling of 6420732064 in words is "six billion, four hundred twenty million, seven hundred thirty-two thousand, sixty-four".