65128281 has 8 divisors (see below), whose sum is σ = 86895360. Its totient is φ = 43390032.

The previous prime is 65128253. The next prime is 65128289. The reversal of 65128281 is 18282156.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65128281 - 2¹¹ = 65126233 is a prime.

It is a super-2 number, since 2×65128281² = 8483385972029922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) 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 (65128289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1225 + ... + 11478.

It is an arithmetic number, because the mean of its divisors is an integer number (10861920).

Almost surely, 2^65128281 is an apocalyptic number.

It is an amenable number.

65128281 is a deficient number, since it is larger than the sum of its proper divisors (21767079).

65128281 is a wasteful number, since it uses less digits than its factorization.

65128281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14415.

The product of its digits is 7680, while the sum is 33.

The square root of 65128281 is about 8070.2094768352. The cubic root of 65128281 is about 402.3369060047.

The spelling of 65128281 in words is "sixty-five million, one hundred twenty-eight thousand, two hundred eighty-one".