65009128 has 16 divisors (see below), whose sum is σ = 123562980. Its totient is φ = 32059008.

The previous prime is 65009123. The next prime is 65009137. The reversal of 65009128 is 82190056.

It can be written as a sum of positive squares in 2 ways, for example, as 62125924 + 2883204 = 7882^2 + 1698^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 65009128.

It is not an unprimeable number, because it can be changed into a prime (65009123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55075 + ... + 56242.

Almost surely, 2^65009128 is an apocalyptic number.

It is an amenable number.

65009128 is a deficient number, since it is larger than the sum of its proper divisors (58553852).

65009128 is a wasteful number, since it uses less digits than its factorization.

65009128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111396 (or 111392 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 65009128 is about 8062.8238229543. The cubic root of 65009128 is about 402.0913960983.

The spelling of 65009128 in words is "sixty-five million, nine thousand, one hundred twenty-eight".