65801840 has 120 divisors (see below), whose sum is σ = 172096128. Its totient is φ = 23362560.

The previous prime is 65801789. The next prime is 65801851. The reversal of 65801840 is 4810856.

65801840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 65801797 and 65801806.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 419042 + ... + 419198.

Almost surely, 2^65801840 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 65801840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86048064).

65801840 is an abundant number, since it is smaller than the sum of its proper divisors (106294288).

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

65801840 is a wasteful number, since it uses less digits than its factorization.

65801840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 65801840 is about 8111.8333316212. The cubic root of 65801840 is about 403.7191460414.

The spelling of 65801840 in words is "sixty-five million, eight hundred one thousand, eight hundred forty".