6641528406 has 16 divisors (see below), whose sum is σ = 13293932544. Its totient is φ = 2212030184.

The previous prime is 6641528389. The next prime is 6641528417. The reversal of 6641528406 is 6048251466.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 445206 + ... + 459881.

It is an arithmetic number, because the mean of its divisors is an integer number (830870784).

Almost surely, 2^6641528406 is an apocalyptic number.

6641528406 is an abundant number, since it is smaller than the sum of its proper divisors (6652404138).

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

6641528406 is a wasteful number, since it uses less digits than its factorization.

6641528406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906315.

The product of its (nonzero) digits is 276480, while the sum is 42.

The square root of 6641528406 is about 81495.5729227054. The cubic root of 6641528406 is about 1879.7034772639.

The spelling of 6641528406 in words is "six billion, six hundred forty-one million, five hundred twenty-eight thousand, four hundred six".