65128427 has 16 divisors (see below), whose sum is σ = 82747392. Its totient is φ = 49865760.

The previous prime is 65128423. The next prime is 65128457. The reversal of 65128427 is 72482156.

It is not a de Polignac number, because 65128427 - 2² = 65128423 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (65128421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8723 + ... + 14364.

It is an arithmetic number, because the mean of its divisors is an integer number (5171712).

Almost surely, 2^65128427 is an apocalyptic number.

65128427 is a deficient number, since it is larger than the sum of its proper divisors (17618965).

65128427 is a wasteful number, since it uses less digits than its factorization.

65128427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23138.

The product of its digits is 26880, while the sum is 35.

The square root of 65128427 is about 8070.2185224441. The cubic root of 65128427 is about 402.3372066480.

The spelling of 65128427 in words is "sixty-five million, one hundred twenty-eight thousand, four hundred twenty-seven".