65681064 has 128 divisors (see below), whose sum is σ = 199756800. Its totient is φ = 19906560.

The previous prime is 65681041. The next prime is 65681071. The reversal of 65681064 is 46018656.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113544 + ... + 114120.

It is an arithmetic number, because the mean of its divisors is an integer number (1560600).

Almost surely, 2^65681064 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 65681064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99878400).

65681064 is an abundant number, since it is smaller than the sum of its proper divisors (134075736).

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

65681064 is a wasteful number, since it uses less digits than its factorization.

65681064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 65681064 is about 8104.3854794796. The cubic root of 65681064 is about 403.4719926387.

The spelling of 65681064 in words is "sixty-five million, six hundred eighty-one thousand, sixty-four".