65649239 has 4 divisors (see below), whose sum is σ = 65680824. Its totient is φ = 65617656.

The previous prime is 65649229. The next prime is 65649263. The reversal of 65649239 is 93294656.

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 65649239 - 2⁸ = 65648983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65649239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65649229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12437 + ... + 16910.

It is an arithmetic number, because the mean of its divisors is an integer number (16420206).

Almost surely, 2^65649239 is an apocalyptic number.

65649239 is a deficient number, since it is larger than the sum of its proper divisors (31585).

65649239 is a wasteful number, since it uses less digits than its factorization.

65649239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31584.

The product of its digits is 349920, while the sum is 44.

The square root of 65649239 is about 8102.4217984501. The cubic root of 65649239 is about 403.4068162147.

The spelling of 65649239 in words is "sixty-five million, six hundred forty-nine thousand, two hundred thirty-nine".