65647138 has 4 divisors (see below), whose sum is σ = 98470710. Its totient is φ = 32823568.

The previous prime is 65647133. The next prime is 65647151. The reversal of 65647138 is 83174656.

It is a happy number.

65647138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 60016009 + 5631129 = 7747^2 + 2373^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 65647138.

It is not an unprimeable number, because it can be changed into a prime (65647133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16411783 + ... + 16411786.

Almost surely, 2^65647138 is an apocalyptic number.

65647138 is a deficient number, since it is larger than the sum of its proper divisors (32823572).

65647138 is a wasteful number, since it uses less digits than its factorization.

65647138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32823571.

The product of its digits is 120960, while the sum is 40.

The square root of 65647138 is about 8102.2921448193. The cubic root of 65647138 is about 403.4025127033.

The spelling of 65647138 in words is "sixty-five million, six hundred forty-seven thousand, one hundred thirty-eight".