65443840 has 192 divisors, whose sum is σ = 198132480. Its totient is φ = 20152320.

The previous prime is 65443811. The next prime is 65443871. The reversal of 65443840 is 4834456.

It is a junction number, because it is equal to n+sod(n) for n = 65443796 and 65443805.

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, 788439 + ... + 788521.

It is an arithmetic number, because the mean of its divisors is an integer number (1031940).

Almost surely, 2^65443840 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 65443840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99066240).

65443840 is an abundant number, since it is smaller than the sum of its proper divisors (132688640).

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

65443840 is a wasteful number, since it uses less digits than its factorization.

65443840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 34.

The square root of 65443840 is about 8089.7367077056. The cubic root of 65443840 is about 402.9856591514.

The spelling of 65443840 in words is "sixty-five million, four hundred forty-three thousand, eight hundred forty".