65408840 has 64 divisors (see below), whose sum is σ = 170380800. Its totient is φ = 22134528.

The previous prime is 65408839. The next prime is 65408851. The reversal of 65408840 is 4880456.

65408840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 65408840.

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, 20642 + ... + 23598.

It is an arithmetic number, because the mean of its divisors is an integer number (2662200).

Almost surely, 2^65408840 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 65408840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85190400).

65408840 is an abundant number, since it is smaller than the sum of its proper divisors (104971960).

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

65408840 is a wasteful number, since it uses less digits than its factorization.

65408840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3054 (or 3050 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 65408840 is about 8087.5731835947. The cubic root of 65408840 is about 402.9138061284.

The spelling of 65408840 in words is "sixty-five million, four hundred eight thousand, eight hundred forty".