66982580 has 96 divisors (see below), whose sum is σ = 168435456. Its totient is φ = 21897216.

The previous prime is 66982549. The next prime is 66982589. The reversal of 66982580 is 8528966.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66982589) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 346964 + ... + 347156.

It is an arithmetic number, because the mean of its divisors is an integer number (1754536).

Almost surely, 2^66982580 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 66982580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84217728).

66982580 is an abundant number, since it is smaller than the sum of its proper divisors (101452876).

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

66982580 is a wasteful number, since it uses less digits than its factorization.

66982580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 66982580 is about 8184.2886068369. The cubic root of 66982580 is about 406.1196069099.

The spelling of 66982580 in words is "sixty-six million, nine hundred eighty-two thousand, five hundred eighty".