65504440 has 16 divisors (see below), whose sum is σ = 147385080. Its totient is φ = 26201760.

The previous prime is 65504407. The next prime is 65504477. The reversal of 65504440 is 4440556.

It is a junction number, because it is equal to n+sod(n) for n = 65504399 and 65504408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 818766 + ... + 818845.

Almost surely, 2^65504440 is an apocalyptic number.

It is an amenable number.

65504440 is an abundant number, since it is smaller than the sum of its proper divisors (81880640).

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

65504440 is a wasteful number, since it uses less digits than its factorization.

65504440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1637622 (or 1637618 counting only the distinct ones).

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

The square root of 65504440 is about 8093.4813275870. The cubic root of 65504440 is about 403.1100069740.

Adding to 65504440 its reverse (4440556), we get a palindrome (69944996).

The spelling of 65504440 in words is "sixty-five million, five hundred four thousand, four hundred forty".