65729849 has 4 divisors (see below), whose sum is σ = 65770020. Its totient is φ = 65689680.

The previous prime is 65729831. The next prime is 65729869. The reversal of 65729849 is 94892756.

It is a happy number.

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 11854249 + 53875600 = 3443^2 + 7340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65729849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65729797 and 65729806.

It is not an unprimeable number, because it can be changed into a prime (65729809) 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, 17522 + ... + 20939.

It is an arithmetic number, because the mean of its divisors is an integer number (16442505).

Almost surely, 2^65729849 is an apocalyptic number.

It is an amenable number.

65729849 is a deficient number, since it is larger than the sum of its proper divisors (40171).

65729849 is a wasteful number, since it uses less digits than its factorization.

65729849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40170.

The product of its digits is 1088640, while the sum is 50.

The square root of 65729849 is about 8107.3947110030. The cubic root of 65729849 is about 403.5718616556.

The spelling of 65729849 in words is "sixty-five million, seven hundred twenty-nine thousand, eight hundred forty-nine".