65947649 has 8 divisors (see below), whose sum is σ = 67335720. Its totient is φ = 64569600.

The previous prime is 65947643. The next prime is 65947691. The reversal of 65947649 is 94674956.

It can be written as a sum of positive squares in 4 ways, for example, as 8673025 + 57274624 = 2945^2 + 7568^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65947649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65947597 and 65947606.

It is not an unprimeable number, because it can be changed into a prime (65947643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11609 + ... + 16329.

It is an arithmetic number, because the mean of its divisors is an integer number (8416965).

Almost surely, 2^65947649 is an apocalyptic number.

It is an amenable number.

65947649 is a deficient number, since it is larger than the sum of its proper divisors (1388071).

65947649 is a wasteful number, since it uses less digits than its factorization.

65947649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5011.

The product of its digits is 1632960, while the sum is 50.

The square root of 65947649 is about 8120.8157841439. The cubic root of 65947649 is about 404.0171238208.

The spelling of 65947649 in words is "sixty-five million, nine hundred forty-seven thousand, six hundred forty-nine".