64640064 has 28 divisors (see below), whose sum is σ = 171027344. Its totient is φ = 21546624.

The previous prime is 64640063. The next prime is 64640083. The reversal of 64640064 is 46004646.

It is not an unprimeable number, because it can be changed into a prime (64640063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168142 + ... + 168525.

Almost surely, 2^64640064 is an apocalyptic number.

64640064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

64640064 is an abundant number, since it is smaller than the sum of its proper divisors (106387280).

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

64640064 is a wasteful number, since it uses less digits than its factorization.

64640064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336682 (or 336672 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 64640064 is about 8039.9044770445. The cubic root of 64640064 is about 401.3290458686.

The spelling of 64640064 in words is "sixty-four million, six hundred forty thousand, sixty-four".