65643648 has 64 divisors (see below), whose sum is σ = 199283520. Its totient is φ = 18754560.

The previous prime is 65643619. The next prime is 65643659. The reversal of 65643648 is 84634656.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (42).

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 7 ways as a sum of consecutive naturals, for example, 9523 + ... + 14898.

It is an arithmetic number, because the mean of its divisors is an integer number (3113805).

Almost surely, 2^65643648 is an apocalyptic number.

It is an amenable number.

65643648 is an abundant number, since it is smaller than the sum of its proper divisors (133639872).

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

65643648 is a wasteful number, since it uses less digits than its factorization.

65643648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24445 (or 24433 counting only the distinct ones).

The product of its digits is 414720, while the sum is 42.

The square root of 65643648 is about 8102.0767708039. The cubic root of 65643648 is about 403.3953638782.

The spelling of 65643648 in words is "sixty-five million, six hundred forty-three thousand, six hundred forty-eight".