65780700 has 72 divisors (see below), whose sum is σ = 196914480. Its totient is φ = 16934400.

The previous prime is 65780681. The next prime is 65780707. The reversal of 65780700 is 708756.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65780707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4920 + ... + 12480.

Almost surely, 2^65780700 is an apocalyptic number.

65780700 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 65780700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98457240).

65780700 is an abundant number, since it is smaller than the sum of its proper divisors (131133780).

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

65780700 is a wasteful number, since it uses less digits than its factorization.

65780700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7607 (or 7600 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 65780700 is about 8110.5301922871. The cubic root of 65780700 is about 403.6759074487.

The spelling of 65780700 in words is "sixty-five million, seven hundred eighty thousand, seven hundred".