6640064490 has 16 divisors (see below), whose sum is σ = 15936154848. Its totient is φ = 1770683856.

The previous prime is 6640064443. The next prime is 6640064549. The reversal of 6640064490 is 944600466.

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, 110667712 + ... + 110667771.

It is an arithmetic number, because the mean of its divisors is an integer number (996009678).

Almost surely, 2^6640064490 is an apocalyptic number.

6640064490 is an abundant number, since it is smaller than the sum of its proper divisors (9296090358).

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

6640064490 is a wasteful number, since it uses less digits than its factorization.

6640064490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221335493.

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 6640064490 is about 81486.5908600918. The cubic root of 6640064490 is about 1879.5653599497.

The spelling of 6640064490 in words is "six billion, six hundred forty million, sixty-four thousand, four hundred ninety".