66880000 has 200 divisors, whose sum is σ = 191751120. Its totient is φ = 23040000.

The previous prime is 66879997. The next prime is 66880001. The reversal of 66880000 is 8866.

It is a tau number, because it is divible by the number of its divisors (200).

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66880001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3519991 + ... + 3520009.

Almost surely, 2^66880000 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 66880000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95875560).

66880000 is an abundant number, since it is smaller than the sum of its proper divisors (124871120).

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

66880000 is an equidigital number, since it uses as much as digits as its factorization.

66880000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68 (or 37 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 66880000 is about 8178.0193201043. The cubic root of 66880000 is about 405.9121846523.

Adding to 66880000 its reverse (8866), we get a palindrome (66888866).

The spelling of 66880000 in words is "sixty-six million, eight hundred eighty thousand".