65112540 has 96 divisors (see below), whose sum is σ = 196922880. Its totient is φ = 16025856.

The previous prime is 65112539. The next prime is 65112547. The reversal of 65112540 is 4521156.

It is a self number, because there is not a number n which added to its sum of digits gives 65112540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65112547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39207 + ... + 40833.

It is an arithmetic number, because the mean of its divisors is an integer number (2051280).

Almost surely, 2^65112540 is an apocalyptic number.

65112540 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 65112540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98461440).

65112540 is an abundant number, since it is smaller than the sum of its proper divisors (131810340).

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

65112540 is a wasteful number, since it uses less digits than its factorization.

65112540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691 (or 1689 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 65112540 is about 8069.2341644049. The cubic root of 65112540 is about 402.3044894905.

Adding to 65112540 its reverse (4521156), we get a palindrome (69633696).

The spelling of 65112540 in words is "sixty-five million, one hundred twelve thousand, five hundred forty".