6640085400 has 96 divisors (see below), whose sum is σ = 22167695760. Its totient is φ = 1634480640.

The previous prime is 6640085383. The next prime is 6640085479. The reversal of 6640085400 is 45800466.

It is a happy number.

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 in 23 ways as a sum of consecutive naturals, for example, 417847 + ... + 433446.

Almost surely, 2^6640085400 is an apocalyptic number.

6640085400 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6640085400 is an abundant number, since it is smaller than the sum of its proper divisors (15527610360).

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

6640085400 is a wasteful number, since it uses less digits than its factorization.

6640085400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851325 (or 851316 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 6640085400 is about 81486.7191633091. The cubic root of 6640085400 is about 1879.5673329060.

Adding to 6640085400 its reverse (45800466), we get a palindrome (6685885866).

The spelling of 6640085400 in words is "six billion, six hundred forty million, eighty-five thousand, four hundred".