65778768 has 120 divisors (see below), whose sum is σ = 202995936. Its totient is φ = 19718400.

The previous prime is 65778751. The next prime is 65778773. The reversal of 65778768 is 86787756.

65778768 is a `hidden beast` number, since 6 + 577 + 8 + 7 + 68 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 207346 + ... + 207662.

Almost surely, 2^65778768 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 65778768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101497968).

65778768 is an abundant number, since it is smaller than the sum of its proper divisors (137217168).

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

65778768 is a wasteful number, since it uses less digits than its factorization.

65778768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473 (or 464 counting only the distinct ones).

The product of its digits is 3951360, while the sum is 54.

The square root of 65778768 is about 8110.4110869918. The cubic root of 65778768 is about 403.6719553802.

The spelling of 65778768 in words is "sixty-five million, seven hundred seventy-eight thousand, seven hundred sixty-eight".