65043540 has 96 divisors (see below), whose sum is σ = 211196160. Its totient is φ = 16587648.

The previous prime is 65043529. The next prime is 65043541. The reversal of 65043540 is 4534056.

65043540 is a `hidden beast` number, since 650 + 4 + 3 + 5 + 4 + 0 = 666.

65043540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65043541) 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 31 ways as a sum of consecutive naturals, for example, 9802 + ... + 15038.

It is an arithmetic number, because the mean of its divisors is an integer number (2199960).

Almost surely, 2^65043540 is an apocalyptic number.

65043540 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 65043540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105598080).

65043540 is an abundant number, since it is smaller than the sum of its proper divisors (146152620).

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

65043540 is a wasteful number, since it uses less digits than its factorization.

65043540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5278 (or 5270 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 65043540 is about 8064.9575324362. The cubic root of 65043540 is about 402.1623314106.

Adding to 65043540 its reverse (4534056), we get a palindrome (69577596).

The spelling of 65043540 in words is "sixty-five million, forty-three thousand, five hundred forty".