65128113 has 12 divisors (see below), whose sum is σ = 97318260. Its totient is φ = 41921376.

The previous prime is 65128109. The next prime is 65128159. The reversal of 65128113 is 31182156.

65128113 is a `hidden beast` number, since 651 + 2 + 8 + 1 + 1 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 26040609 + 39087504 = 5103^2 + 6252^2 .

It is not a de Polignac number, because 65128113 - 2² = 65128109 is a prime.

It is a super-2 number, since 2×65128113² = 8483342205881538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65128813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124506 + ... + 125027.

It is an arithmetic number, because the mean of its divisors is an integer number (8109855).

Almost surely, 2^65128113 is an apocalyptic number.

It is an amenable number.

65128113 is a deficient number, since it is larger than the sum of its proper divisors (32190147).

65128113 is a wasteful number, since it uses less digits than its factorization.

65128113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249568 (or 249565 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 65128113 is about 8070.1990681767. The cubic root of 65128113 is about 402.3365600584.

The spelling of 65128113 in words is "sixty-five million, one hundred twenty-eight thousand, one hundred thirteen".