65638829 has 4 divisors (see below), whose sum is σ = 66252384. Its totient is φ = 65025276.

The previous prime is 65638817. The next prime is 65638831. The reversal of 65638829 is 92883656.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65638829 - 2⁴ = 65638813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65638879) 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, 306617 + ... + 306830.

It is an arithmetic number, because the mean of its divisors is an integer number (16563096).

Almost surely, 2^65638829 is an apocalyptic number.

It is an amenable number.

65638829 is a deficient number, since it is larger than the sum of its proper divisors (613555).

65638829 is a wasteful number, since it uses less digits than its factorization.

65638829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613554.

The product of its digits is 622080, while the sum is 47.

The square root of 65638829 is about 8101.7793724589. The cubic root of 65638829 is about 403.3854923476.

The spelling of 65638829 in words is "sixty-five million, six hundred thirty-eight thousand, eight hundred twenty-nine".