64009640 has 16 divisors (see below), whose sum is σ = 144021780. Its totient is φ = 25603840.

The previous prime is 64009633. The next prime is 64009661. The reversal of 64009640 is 4690046.

64009640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 57729604 + 6280036 = 7598^2 + 2506^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800081 + ... + 800160.

Almost surely, 2^64009640 is an apocalyptic number.

It is an amenable number.

64009640 is an abundant number, since it is smaller than the sum of its proper divisors (80012140).

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

64009640 is a wasteful number, since it uses less digits than its factorization.

64009640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1600252 (or 1600248 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 64009640 is about 8000.6024773138. The cubic root of 64009640 is about 400.0200823251.

Adding to 64009640 its reverse (4690046), we get a palindrome (68699686).

The spelling of 64009640 in words is "sixty-four million, nine thousand, six hundred forty".