65780736 has 264 divisors, whose sum is σ = 224023680. Its totient is φ = 17031168.

The previous prime is 65780723. The next prime is 65780761. The reversal of 65780736 is 63708756.

65780736 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2860021 + ... + 2860043.

Almost surely, 2^65780736 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 65780736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112011840).

65780736 is an abundant number, since it is smaller than the sum of its proper divisors (158242944).

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

65780736 is a wasteful number, since it uses less digits than its factorization.

65780736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79 (or 54 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 42.

The square root of 65780736 is about 8110.5324116238. The cubic root of 65780736 is about 403.6759810890.

The spelling of 65780736 in words is "sixty-five million, seven hundred eighty thousand, seven hundred thirty-six".