66867980 has 48 divisors (see below), whose sum is σ = 144244800. Its totient is φ = 26028288.

The previous prime is 66867949. The next prime is 66867989. The reversal of 66867980 is 8976866.

It is not an unprimeable number, because it can be changed into a prime (66867989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210782 + ... + 211098.

It is an arithmetic number, because the mean of its divisors is an integer number (3005100).

Almost surely, 2^66867980 is an apocalyptic number.

It is an amenable number.

66867980 is an abundant number, since it is smaller than the sum of its proper divisors (77376820).

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

66867980 is a wasteful number, since it uses less digits than its factorization.

66867980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578 (or 576 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 66867980 is about 8177.2843903095. The cubic root of 66867980 is about 405.8878656890.

The spelling of 66867980 in words is "sixty-six million, eight hundred sixty-seven thousand, nine hundred eighty".