65220816 has 40 divisors (see below), whose sum is σ = 169440544. Its totient is φ = 21617280.

The previous prime is 65220781. The next prime is 65220817. The reversal of 65220816 is 61802256.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65220817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4935 + ... + 12441.

Almost surely, 2^65220816 is an apocalyptic number.

It is an amenable number.

65220816 is an abundant number, since it is smaller than the sum of its proper divisors (104219728).

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

65220816 is a wasteful number, since it uses less digits than its factorization.

65220816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7699 (or 7693 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 65220816 is about 8075.9405644172. The cubic root of 65220816 is about 402.5273641106.

The spelling of 65220816 in words is "sixty-five million, two hundred twenty thousand, eight hundred sixteen".