65636240 has 40 divisors (see below), whose sum is σ = 153793728. Its totient is φ = 26049920.

The previous prime is 65636237. The next prime is 65636243. The reversal of 65636240 is 4263656.

65636240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (65636237) and next prime (65636243).

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 65636197 and 65636206.

It is not an unprimeable number, because it can be changed into a prime (65636243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7349 + ... + 13611.

Almost surely, 2^65636240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65636240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76896864).

65636240 is an abundant number, since it is smaller than the sum of its proper divisors (88157488).

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

65636240 is a wasteful number, since it uses less digits than its factorization.

65636240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6407 (or 6401 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 65636240 is about 8101.6195911682. The cubic root of 65636240 is about 403.3801886842.

Adding to 65636240 its reverse (4263656), we get a palindrome (69899896).

The spelling of 65636240 in words is "sixty-five million, six hundred thirty-six thousand, two hundred forty".