66640060 has 24 divisors (see below), whose sum is σ = 142240896. Its totient is φ = 26218560.

The previous prime is 66640043. The next prime is 66640061. The reversal of 66640060 is 6004666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66640061) 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, 26092 + ... + 28531.

It is an arithmetic number, because the mean of its divisors is an integer number (5926704).

Almost surely, 2^66640060 is an apocalyptic number.

It is an amenable number.

66640060 is an abundant number, since it is smaller than the sum of its proper divisors (75600836).

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

66640060 is a wasteful number, since it uses less digits than its factorization.

66640060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54693 (or 54691 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 66640060 is about 8163.3363277523. The cubic root of 66640060 is about 405.4261834868.

The spelling of 66640060 in words is "sixty-six million, six hundred forty thousand, sixty".