65839878720 has 672 divisors, whose sum is σ = 283501161216. Its totient is φ = 13624934400.

The previous prime is 65839878703. The next prime is 65839878721. The reversal of 65839878720 is 2787893856.

It is a tau number, because it is divible by the number of its divisors (672).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (65839878721) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 74732680 + ... + 74733560.

It is an arithmetic number, because the mean of its divisors is an integer number (421876728).

Almost surely, 2^65839878720 is an apocalyptic number.

65839878720 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 65839878720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141750580608).

65839878720 is an abundant number, since it is smaller than the sum of its proper divisors (217661282496).

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

65839878720 is a wasteful number, since it uses less digits than its factorization.

65839878720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1259 (or 1246 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 63.

The spelling of 65839878720 in words is "sixty-five billion, eight hundred thirty-nine million, eight hundred seventy-eight thousand, seven hundred twenty".