65789856 has 144 divisors (see below), whose sum is σ = 215036640. Its totient is φ = 18869760.

The previous prime is 65789851. The next prime is 65789869. The reversal of 65789856 is 65898756.

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (65789851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59646 + ... + 60738.

It is an arithmetic number, because the mean of its divisors is an integer number (1493310).

Almost surely, 2^65789856 is an apocalyptic number.

65789856 is a gapful number since it is divisible by the number (66) 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 65789856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107518320).

65789856 is an abundant number, since it is smaller than the sum of its proper divisors (149246784).

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

65789856 is a wasteful number, since it uses less digits than its factorization.

65789856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139 (or 1128 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 54.

The square root of 65789856 is about 8111.0946240319. The cubic root of 65789856 is about 403.6946357643.

Subtracting 65789856 from its reverse (65898756), we obtain a square (108900 = 330²).

The spelling of 65789856 in words is "sixty-five million, seven hundred eighty-nine thousand, eight hundred fifty-six".