65644516 has 36 divisors (see below), whose sum is σ = 138253500. Its totient is φ = 27160896.

The previous prime is 65644499. The next prime is 65644517. The reversal of 65644516 is 61544656.

It can be written as a sum of positive squares in 2 ways, for example, as 51984100 + 13660416 = 7210^2 + 3696^2 .

It is not an unprimeable number, because it can be changed into a prime (65644517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91 + ... + 11458.

It is an arithmetic number, because the mean of its divisors is an integer number (3840375).

Almost surely, 2^65644516 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 65644516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69126750).

65644516 is an abundant number, since it is smaller than the sum of its proper divisors (72608984).

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

65644516 is a wasteful number, since it uses less digits than its factorization.

65644516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11596 (or 11587 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The square root of 65644516 is about 8102.1303371397. The cubic root of 65644516 is about 403.3971418904.

The spelling of 65644516 in words is "sixty-five million, six hundred forty-four thousand, five hundred sixteen".