65211630 has 64 divisors (see below), whose sum is σ = 173138688. Its totient is φ = 15586560.

The previous prime is 65211613. The next prime is 65211661. The reversal of 65211630 is 3611256.

It is a self number, because there is not a number n which added to its sum of digits gives 65211630.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22737 + ... + 25443.

It is an arithmetic number, because the mean of its divisors is an integer number (2705292).

Almost surely, 2^65211630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65211630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86569344).

65211630 is an abundant number, since it is smaller than the sum of its proper divisors (107927058).

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

65211630 is a wasteful number, since it uses less digits than its factorization.

65211630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2801.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 65211630 is about 8075.3718180651. The cubic root of 65211630 is about 402.5084652875.

Adding to 65211630 its reverse (3611256), we get a palindrome (68822886).

The spelling of 65211630 in words is "sixty-five million, two hundred eleven thousand, six hundred thirty".