65218220 has 12 divisors (see below), whose sum is σ = 136958304. Its totient is φ = 26087280.

The previous prime is 65218193. The next prime is 65218253. The reversal of 65218220 is 2281256.

It is a self number, because there is not a number n which added to its sum of digits gives 65218220.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1630436 + ... + 1630475.

It is an arithmetic number, because the mean of its divisors is an integer number (11413192).

Almost surely, 2^65218220 is an apocalyptic number.

It is an amenable number.

65218220 is an abundant number, since it is smaller than the sum of its proper divisors (71740084).

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

65218220 is a wasteful number, since it uses less digits than its factorization.

65218220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3260920 (or 3260918 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 65218220 is about 8075.7798385048. The cubic root of 65218220 is about 402.5220234082.

Adding to 65218220 its reverse (2281256), we get a palindrome (67499476).

It can be divided in two parts, 6521 and 8220, that added together give a palindrome (14741).

The spelling of 65218220 in words is "sixty-five million, two hundred eighteen thousand, two hundred twenty".