65218720 has 48 divisors (see below), whose sum is σ = 176093568. Its totient is φ = 22360320.

The previous prime is 65218693. The next prime is 65218723. The reversal of 65218720 is 2781256.

It is not an unprimeable number, because it can be changed into a prime (65218723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27996 + ... + 30235.

It is an arithmetic number, because the mean of its divisors is an integer number (3668616).

Almost surely, 2^65218720 is an apocalyptic number.

It is an amenable number.

65218720 is an abundant number, since it is smaller than the sum of its proper divisors (110874848).

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

65218720 is a wasteful number, since it uses less digits than its factorization.

65218720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58253 (or 58245 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 65218720 is about 8075.8107952081. The cubic root of 65218720 is about 402.5230520599.

Adding to 65218720 its reverse (2781256), we get a palindrome (67999976).

The spelling of 65218720 in words is "sixty-five million, two hundred eighteen thousand, seven hundred twenty".