66814680 has 32 divisors (see below), whose sum is σ = 200444400. Its totient is φ = 17817216.

The previous prime is 66814673. The next prime is 66814681. The reversal of 66814680 is 8641866.

It is a super-3 number, since 3×66814680³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66814681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278275 + ... + 278514.

Almost surely, 2^66814680 is an apocalyptic number.

66814680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66814680 is an abundant number, since it is smaller than the sum of its proper divisors (133629720).

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

66814680 is a wasteful number, since it uses less digits than its factorization.

66814680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556803 (or 556799 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 66814680 is about 8174.0247124657. The cubic root of 66814680 is about 405.7799935613.

The spelling of 66814680 in words is "sixty-six million, eight hundred fourteen thousand, six hundred eighty".