64006660 has 12 divisors (see below), whose sum is σ = 134414028. Its totient is φ = 25602656.

The previous prime is 64006637. The next prime is 64006673. The reversal of 64006660 is 6660046.

It can be written as a sum of positive squares in 2 ways, for example, as 31539456 + 32467204 = 5616^2 + 5698^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1600147 + ... + 1600186.

It is an arithmetic number, because the mean of its divisors is an integer number (11201169).

Almost surely, 2^64006660 is an apocalyptic number.

It is an amenable number.

64006660 is an abundant number, since it is smaller than the sum of its proper divisors (70407368).

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

64006660 is a wasteful number, since it uses less digits than its factorization.

64006660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3200342 (or 3200340 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 64006660 is about 8000.4162391716. The cubic root of 64006660 is about 400.0138745187.

The spelling of 64006660 in words is "sixty-four million, six thousand, six hundred sixty".