65781386928 has 240 divisors, whose sum is σ = 196243022976. Its totient is φ = 21319925760.

The previous prime is 65781386927. The next prime is 65781386939. The reversal of 65781386928 is 82968318756.

65781386928 is a `hidden beast` number, since 6 + 578 + 1 + 38 + 6 + 9 + 28 = 666.

It is not an unprimeable number, because it can be changed into a prime (65781386927) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42965523 + ... + 42967053.

Almost surely, 2^65781386928 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 65781386928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98121511488).

65781386928 is an abundant number, since it is smaller than the sum of its proper divisors (130461636048).

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

65781386928 is a wasteful number, since it uses less digits than its factorization.

65781386928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1854 (or 1836 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 63.

The spelling of 65781386928 in words is "sixty-five billion, seven hundred eighty-one million, three hundred eighty-six thousand, nine hundred twenty-eight".