65641340 has 12 divisors (see below), whose sum is σ = 137846856. Its totient is φ = 26256528.

The previous prime is 65641339. The next prime is 65641343. The reversal of 65641340 is 4314656.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65641343) 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, 1641014 + ... + 1641053.

It is an arithmetic number, because the mean of its divisors is an integer number (11487238).

Almost surely, 2^65641340 is an apocalyptic number.

It is an amenable number.

65641340 is an abundant number, since it is smaller than the sum of its proper divisors (72205516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65641340 is a wasteful number, since it uses less digits than its factorization.

65641340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3282076 (or 3282074 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 65641340 is about 8101.9343369346. The cubic root of 65641340 is about 403.3906360919.

Adding to 65641340 its reverse (4314656), we get a palindrome (69955996).

The spelling of 65641340 in words is "sixty-five million, six hundred forty-one thousand, three hundred forty".