65128105 has 48 divisors (see below), whose sum is σ = 101450880. Its totient is φ = 39771648.

The previous prime is 65128097. The next prime is 65128109. The reversal of 65128105 is 50182156.

It is not a de Polignac number, because 65128105 - 2³ = 65128097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65128109) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 78724 + ... + 79546.

It is an arithmetic number, because the mean of its divisors is an integer number (2113560).

Almost surely, 2^65128105 is an apocalyptic number.

It is an amenable number.

65128105 is a deficient number, since it is larger than the sum of its proper divisors (36322775).

65128105 is a wasteful number, since it uses less digits than its factorization.

65128105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878 (or 871 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 65128105 is about 8070.1985725260. The cubic root of 65128105 is about 402.3365435848.

The spelling of 65128105 in words is "sixty-five million, one hundred twenty-eight thousand, one hundred five".