65011220 has 24 divisors (see below), whose sum is σ = 140214984. Its totient is φ = 25301376.

The previous prime is 65011201. The next prime is 65011223. The reversal of 65011220 is 2211056.

It can be written as a sum of positive squares in 4 ways, for example, as 5597956 + 59413264 = 2366^2 + 7708^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65011223) 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, 43187 + ... + 44666.

It is an arithmetic number, because the mean of its divisors is an integer number (5842291).

Almost surely, 2^65011220 is an apocalyptic number.

It is an amenable number.

65011220 is an abundant number, since it is smaller than the sum of its proper divisors (75203764).

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

65011220 is a wasteful number, since it uses less digits than its factorization.

65011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87899 (or 87897 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 65011220 is about 8062.9535531342. The cubic root of 65011220 is about 402.0957091653.

Adding to 65011220 its reverse (2211056), we get a palindrome (67222276).

The spelling of 65011220 in words is "sixty-five million, eleven thousand, two hundred twenty".