65123140 has 24 divisors (see below), whose sum is σ = 138017880. Its totient is φ = 25809408.

The previous prime is 65123137. The next prime is 65123147. The reversal of 65123140 is 4132156.

65123140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 28132416 + 36990724 = 5304^2 + 6082^2 .

It is not an unprimeable number, because it can be changed into a prime (65123147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12757 + ... + 17116.

It is an arithmetic number, because the mean of its divisors is an integer number (5750745).

Almost surely, 2^65123140 is an apocalyptic number.

It is an amenable number.

65123140 is an abundant number, since it is smaller than the sum of its proper divisors (72894740).

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

65123140 is a wasteful number, since it uses less digits than its factorization.

65123140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29991 (or 29989 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 65123140 is about 8069.8909534144. The cubic root of 65123140 is about 402.3263193674.

Adding to 65123140 its reverse (4132156), we get a palindrome (69255296).

The spelling of 65123140 in words is "sixty-five million, one hundred twenty-three thousand, one hundred forty".