65128259 has 4 divisors (see below), whose sum is σ = 74432304. Its totient is φ = 55824216.

The previous prime is 65128253. The next prime is 65128289. The reversal of 65128259 is 95282156.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-65128259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65128253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4652012 + ... + 4652025.

It is an arithmetic number, because the mean of its divisors is an integer number (18608076).

Almost surely, 2^65128259 is an apocalyptic number.

65128259 is a deficient number, since it is larger than the sum of its proper divisors (9304045).

65128259 is an equidigital number, since it uses as much as digits as its factorization.

65128259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9304044.

The product of its digits is 43200, while the sum is 38.

The square root of 65128259 is about 8070.2081137973. The cubic root of 65128259 is about 402.3368607022.

The spelling of 65128259 in words is "sixty-five million, one hundred twenty-eight thousand, two hundred fifty-nine".