65520440 has 16 divisors (see below), whose sum is σ = 147421080. Its totient is φ = 26208160.

The previous prime is 65520421. The next prime is 65520461. The reversal of 65520440 is 4402556.

It is a zygodrome in base 2.

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, 818966 + ... + 819045.

Almost surely, 2^65520440 is an apocalyptic number.

It is an amenable number.

65520440 is an abundant number, since it is smaller than the sum of its proper divisors (81900640).

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

65520440 is a wasteful number, since it uses less digits than its factorization.

65520440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638022 (or 1638018 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 65520440 is about 8094.4697170352. The cubic root of 65520440 is about 403.1428252839.

Adding to 65520440 its reverse (4402556), we get a palindrome (69922996).

The spelling of 65520440 in words is "sixty-five million, five hundred twenty thousand, four hundred forty".