65840865 has 32 divisors (see below), whose sum is σ = 107568000. Its totient is φ = 34383360.

The previous prime is 65840861. The next prime is 65840867. The reversal of 65840865 is 56804856.

It is not a de Polignac number, because 65840865 - 2² = 65840861 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65840861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 198750 + ... + 199080.

It is an arithmetic number, because the mean of its divisors is an integer number (3361500).

Almost surely, 2^65840865 is an apocalyptic number.

It is an amenable number.

65840865 is a deficient number, since it is larger than the sum of its proper divisors (41727135).

65840865 is a wasteful number, since it uses less digits than its factorization.

65840865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577.

The product of its (nonzero) digits is 230400, while the sum is 42.

The square root of 65840865 is about 8114.2384115824. The cubic root of 65840865 is about 403.7989413079.

The spelling of 65840865 in words is "sixty-five million, eight hundred forty thousand, eight hundred sixty-five".