66870280 has 16 divisors (see below), whose sum is σ = 150458220. Its totient is φ = 26748096.

The previous prime is 66870277. The next prime is 66870281. The reversal of 66870280 is 8207866.

66870280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 58951684 + 7918596 = 7678^2 + 2814^2 .

It is not an unprimeable number, because it can be changed into a prime (66870281) 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 3 ways as a sum of consecutive naturals, for example, 835839 + ... + 835918.

Almost surely, 2^66870280 is an apocalyptic number.

It is an amenable number.

66870280 is an abundant number, since it is smaller than the sum of its proper divisors (83587940).

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

66870280 is a wasteful number, since it uses less digits than its factorization.

66870280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671768 (or 1671764 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 66870280 is about 8177.4250225850. The cubic root of 66870280 is about 405.8925192935.

The spelling of 66870280 in words is "sixty-six million, eight hundred seventy thousand, two hundred eighty".