65012640 has 192 divisors, whose sum is σ = 255467520. Its totient is φ = 13501440.

The previous prime is 65012639. The next prime is 65012657. The reversal of 65012640 is 4621056.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 65012640.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36081 + ... + 37839.

It is an arithmetic number, because the mean of its divisors is an integer number (1330560).

Almost surely, 2^65012640 is an apocalyptic number.

65012640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65012640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127733760).

65012640 is an abundant number, since it is smaller than the sum of its proper divisors (190454880).

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

65012640 is a wasteful number, since it uses less digits than its factorization.

65012640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795 (or 1787 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 65012640 is about 8063.0416097153. The cubic root of 65012640 is about 402.0986367203.

Adding to 65012640 its reverse (4621056), we get a palindrome (69633696).

The spelling of 65012640 in words is "sixty-five million, twelve thousand, six hundred forty".