65209616 has 30 divisors (see below), whose sum is σ = 130581486. Its totient is φ = 31545600.

The previous prime is 65209607. The next prime is 65209631. The reversal of 65209616 is 61690256.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 64963600 + 246016 = 8060^2 + 496^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13256 + ... + 17496.

Almost surely, 2^65209616 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 65209616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65290743).

65209616 is an abundant number, since it is smaller than the sum of its proper divisors (65371870).

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

65209616 is a wasteful number, since it uses less digits than its factorization.

65209616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4311 (or 4274 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 65209616 is about 8075.2471169618. The cubic root of 65209616 is about 402.5043215461.

The spelling of 65209616 in words is "sixty-five million, two hundred nine thousand, six hundred sixteen".