65643128 has 8 divisors (see below), whose sum is σ = 123080880. Its totient is φ = 32821560.

The previous prime is 65643077. The next prime is 65643131. The reversal of 65643128 is 82134656.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4102688 + ... + 4102703.

It is an arithmetic number, because the mean of its divisors is an integer number (15385110).

Almost surely, 2^65643128 is an apocalyptic number.

It is an amenable number.

65643128 is a deficient number, since it is larger than the sum of its proper divisors (57437752).

65643128 is a wasteful number, since it uses less digits than its factorization.

65643128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8205397 (or 8205393 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 65643128 is about 8102.0446802026. The cubic root of 65643128 is about 403.3942987020.

The spelling of 65643128 in words is "sixty-five million, six hundred forty-three thousand, one hundred twenty-eight".