65128823 has 4 divisors (see below), whose sum is σ = 65223768. Its totient is φ = 65033880.

The previous prime is 65128813. The next prime is 65128837. The reversal of 65128823 is 32882156.

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

It is a cyclic number.

It is not a de Polignac number, because 65128823 - 2⁶ = 65128759 is a prime.

It is a super-3 number, since 3×65128823³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 46436 + ... + 47817.

It is an arithmetic number, because the mean of its divisors is an integer number (16305942).

Almost surely, 2^65128823 is an apocalyptic number.

65128823 is a deficient number, since it is larger than the sum of its proper divisors (94945).

65128823 is an equidigital number, since it uses as much as digits as its factorization.

65128823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94944.

The product of its digits is 23040, while the sum is 35.

The square root of 65128823 is about 8070.2430570584. The cubic root of 65128823 is about 402.3380220892.

The spelling of 65128823 in words is "sixty-five million, one hundred twenty-eight thousand, eight hundred twenty-three".