65320440 has 64 divisors (see below), whose sum is σ = 200534400. Its totient is φ = 17012352.

The previous prime is 65320427. The next prime is 65320487. The reversal of 65320440 is 4402356.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 65320440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1170 + ... + 11489.

It is an arithmetic number, because the mean of its divisors is an integer number (3133350).

Almost surely, 2^65320440 is an apocalyptic number.

65320440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65320440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100267200).

65320440 is an abundant number, since it is smaller than the sum of its proper divisors (135213960).

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

65320440 is a wasteful number, since it uses less digits than its factorization.

65320440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12716 (or 12712 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 65320440 is about 8082.1061611439. The cubic root of 65320440 is about 402.7322117229.

Adding to 65320440 its reverse (4402356), we get a palindrome (69722796).

The spelling of 65320440 in words is "sixty-five million, three hundred twenty thousand, four hundred forty".