65445040 has 40 divisors (see below), whose sum is σ = 152856288. Its totient is φ = 26058240.

The previous prime is 65445007. The next prime is 65445043. The reversal of 65445040 is 4054456.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (65445043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16885 + ... + 20395.

Almost surely, 2^65445040 is an apocalyptic number.

It is an amenable number.

65445040 is an abundant number, since it is smaller than the sum of its proper divisors (87411248).

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

65445040 is a wasteful number, since it uses less digits than its factorization.

65445040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3757 (or 3751 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 65445040 is about 8089.8108754161. The cubic root of 65445040 is about 402.9881222293.

Adding to 65445040 its reverse (4054456), we get a palindrome (69499496).

The spelling of 65445040 in words is "sixty-five million, four hundred forty-five thousand, forty".