65018240 has 128 divisors (see below), whose sum is σ = 185656320. Its totient is φ = 21288960.

The previous prime is 65018221. The next prime is 65018243. The reversal of 65018240 is 4281056.

It is a tau number, because it is divible by the number of its divisors (128).

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65018243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102725 + ... + 103355.

It is an arithmetic number, because the mean of its divisors is an integer number (1450440).

Almost surely, 2^65018240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65018240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92828160).

65018240 is an abundant number, since it is smaller than the sum of its proper divisors (120638080).

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

65018240 is a wasteful number, since it uses less digits than its factorization.

65018240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680 (or 668 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 65018240 is about 8063.3888657313. The cubic root of 65018240 is about 402.1101815917.

Adding to 65018240 its reverse (4281056), we get a palindrome (69299296).

It can be divided in two parts, 6501 and 8240, that added together give a palindrome (14741).

The spelling of 65018240 in words is "sixty-five million, eighteen thousand, two hundred forty".