65840236 has 48 divisors (see below), whose sum is σ = 144410112. Its totient is φ = 25516800.

The previous prime is 65840231. The next prime is 65840239. The reversal of 65840236 is 63204856.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (65840231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73785 + ... + 74671.

It is an arithmetic number, because the mean of its divisors is an integer number (3008544).

Almost surely, 2^65840236 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 65840236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72205056).

65840236 is an abundant number, since it is smaller than the sum of its proper divisors (78569876).

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

65840236 is a wasteful number, since it uses less digits than its factorization.

65840236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150 (or 1148 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 65840236 is about 8114.1996524611. The cubic root of 65840236 is about 403.7976554279.

The spelling of 65840236 in words is "sixty-five million, eight hundred forty thousand, two hundred thirty-six".