65140220 has 12 divisors (see below), whose sum is σ = 136794504. Its totient is φ = 26056080.

The previous prime is 65140219. The next prime is 65140223. The reversal of 65140220 is 2204156.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 3257011 = 65140220 / (6 + 5 + 1 + 4 + 0 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 65140192 and 65140201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65140223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1628486 + ... + 1628525.

It is an arithmetic number, because the mean of its divisors is an integer number (11399542).

Almost surely, 2^65140220 is an apocalyptic number.

It is an amenable number.

65140220 is an abundant number, since it is smaller than the sum of its proper divisors (71654284).

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

65140220 is a wasteful number, since it uses less digits than its factorization.

65140220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3257020 (or 3257018 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 65140220 is about 8070.9491387321. The cubic root of 65140220 is about 402.3614893181.

Adding to 65140220 its reverse (2204156), we get a palindrome (67344376).

The spelling of 65140220 in words is "sixty-five million, one hundred forty thousand, two hundred twenty".