66580280 has 64 divisors (see below), whose sum is σ = 164052000. Its totient is φ = 24168960.

The previous prime is 66580273. The next prime is 66580301. The reversal of 66580280 is 8208566.

It is a self number, because there is not a number n which added to its sum of digits gives 66580280.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30671 + ... + 32769.

Almost surely, 2^66580280 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 66580280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82026000).

66580280 is an abundant number, since it is smaller than the sum of its proper divisors (97471720).

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

66580280 is a wasteful number, since it uses less digits than its factorization.

66580280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2184 (or 2180 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 66580280 is about 8159.6740130964. The cubic root of 66580280 is about 405.3049169493.

The spelling of 66580280 in words is "sixty-six million, five hundred eighty thousand, two hundred eighty".