65980000 has 60 divisors (see below), whose sum is σ = 162369900. Its totient is φ = 26384000.

The previous prime is 65979983. The next prime is 65980003. The reversal of 65980000 is 8956.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65980003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 18351 + ... + 21649.

It is an arithmetic number, because the mean of its divisors is an integer number (2706165).

Almost surely, 2^65980000 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 65980000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81184950).

65980000 is an abundant number, since it is smaller than the sum of its proper divisors (96389900).

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

65980000 is an equidigital number, since it uses as much as digits as its factorization.

65980000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3329 (or 3306 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 65980000 is about 8122.8073964609. The cubic root of 65980000 is about 404.0831773320.

Adding to 65980000 its reverse (8956), we get a palindrome (65988956).

The spelling of 65980000 in words is "sixty-five million, nine hundred eighty thousand".