65623213 has 4 divisors (see below), whose sum is σ = 69483420. Its totient is φ = 61763008.

The previous prime is 65623193. The next prime is 65623219. The reversal of 65623213 is 31232656.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19342404 + 46280809 = 4398^2 + 6803^2 .

It is a cyclic number.

It is not a de Polignac number, because 65623213 - 2⁹ = 65622701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65623219) 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, 1930078 + ... + 1930111.

It is an arithmetic number, because the mean of its divisors is an integer number (17370855).

Almost surely, 2^65623213 is an apocalyptic number.

It is an amenable number.

65623213 is a deficient number, since it is larger than the sum of its proper divisors (3860207).

65623213 is a wasteful number, since it uses less digits than its factorization.

65623213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3860206.

The product of its digits is 6480, while the sum is 28.

The square root of 65623213 is about 8100.8155762244. The cubic root of 65623213 is about 403.3535002704.

Adding to 65623213 its reverse (31232656), we get a palindrome (96855869).

The spelling of 65623213 in words is "sixty-five million, six hundred twenty-three thousand, two hundred thirteen".