65911040 has 144 divisors (see below), whose sum is σ = 180795888. Its totient is φ = 22806528.

The previous prime is 65911033. The next prime is 65911063. The reversal of 65911040 is 4011956.

65911040 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 8 ways, for example, as 4946176 + 60964864 = 2224^2 + 7808^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 282764 + ... + 282996.

It is an arithmetic number, because the mean of its divisors is an integer number (1255527).

Almost surely, 2^65911040 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 65911040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90397944).

65911040 is an abundant number, since it is smaller than the sum of its proper divisors (114884848).

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

65911040 is a wasteful number, since it uses less digits than its factorization.

65911040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 65911040 is about 8118.5614489268. The cubic root of 65911040 is about 403.9423503662.

Adding to 65911040 its reverse (4011956), we get a palindrome (69922996).

The spelling of 65911040 in words is "sixty-five million, nine hundred eleven thousand, forty".