66587860 has 24 divisors (see below), whose sum is σ = 139991040. Its totient is φ = 26605344.

The previous prime is 66587839. The next prime is 66587863. The reversal of 66587860 is 6878566.

It is a happy number.

66587860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 66587860.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66587863) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 28621 + ... + 30859.

It is an arithmetic number, because the mean of its divisors is an integer number (5832960).

Almost surely, 2^66587860 is an apocalyptic number.

It is an amenable number.

66587860 is an abundant number, since it is smaller than the sum of its proper divisors (73403180).

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

66587860 is a wasteful number, since it uses less digits than its factorization.

66587860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3735 (or 3733 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 66587860 is about 8160.1384792171. The cubic root of 66587860 is about 405.3202973527.

The spelling of 66587860 in words is "sixty-six million, five hundred eighty-seven thousand, eight hundred sixty".