64643120 has 20 divisors (see below), whose sum is σ = 150295440. Its totient is φ = 25857216.

The previous prime is 64643099. The next prime is 64643171. The reversal of 64643120 is 2134646.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 64643120.

It is an unprimeable number.

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, 403940 + ... + 404099.

It is an arithmetic number, because the mean of its divisors is an integer number (7514772).

Almost surely, 2^64643120 is an apocalyptic number.

It is an amenable number.

64643120 is an abundant number, since it is smaller than the sum of its proper divisors (85652320).

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

64643120 is a wasteful number, since it uses less digits than its factorization.

64643120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808052 (or 808046 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 64643120 is about 8040.0945268075. The cubic root of 64643120 is about 401.3353703375.

Adding to 64643120 its reverse (2134646), we get a palindrome (66777766).

The spelling of 64643120 in words is "sixty-four million, six hundred forty-three thousand, one hundred twenty".