66740280 has 64 divisors (see below), whose sum is σ = 200823840. Its totient is φ = 17743872.

The previous prime is 66740263. The next prime is 66740291. The reversal of 66740280 is 8204766.

66740280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 54232 + ... + 55448.

Almost surely, 2^66740280 is an apocalyptic number.

66740280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66740280 is an abundant number, since it is smaller than the sum of its proper divisors (134083560).

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

66740280 is a wasteful number, since it uses less digits than its factorization.

66740280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688 (or 1684 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 66740280 is about 8169.4724431875. The cubic root of 66740280 is about 405.6293218612.

The spelling of 66740280 in words is "sixty-six million, seven hundred forty thousand, two hundred eighty".