64668440 has 16 divisors (see below), whose sum is σ = 145504080. Its totient is φ = 25867360.

The previous prime is 64668421. The next prime is 64668469. The reversal of 64668440 is 4486646.

64668440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 64668394 and 64668403.

It is a congruent number.

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, 808316 + ... + 808395.

It is an arithmetic number, because the mean of its divisors is an integer number (9094005).

Almost surely, 2^64668440 is an apocalyptic number.

It is an amenable number.

64668440 is an abundant number, since it is smaller than the sum of its proper divisors (80835640).

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

64668440 is a wasteful number, since it uses less digits than its factorization.

64668440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616722 (or 1616718 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 38.

The square root of 64668440 is about 8041.6689810014. The cubic root of 64668440 is about 401.3877630496.

The spelling of 64668440 in words is "sixty-four million, six hundred sixty-eight thousand, four hundred forty".