66028140 has 72 divisors (see below), whose sum is σ = 206763648. Its totient is φ = 17038080.

The previous prime is 66028133. The next prime is 66028141. The reversal of 66028140 is 4182066.

It is not an unprimeable number, because it can be changed into a prime (66028141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 337 + ... + 11496.

Almost surely, 2^66028140 is an apocalyptic number.

66028140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66028140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103381824).

66028140 is an abundant number, since it is smaller than the sum of its proper divisors (140735508).

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

66028140 is a wasteful number, since it uses less digits than its factorization.

66028140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11879 (or 11874 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 66028140 is about 8125.7701173489. The cubic root of 66028140 is about 404.1814284945.

The spelling of 66028140 in words is "sixty-six million, twenty-eight thousand, one hundred forty".