66785280 has 104 divisors (see below), whose sum is σ = 213883392. Its totient is φ = 17793024.

The previous prime is 66785273. The next prime is 66785311. The reversal of 66785280 is 8258766.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60897 + ... + 61983.

Almost surely, 2^66785280 is an apocalyptic number.

66785280 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 66785280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106941696).

66785280 is an abundant number, since it is smaller than the sum of its proper divisors (147098112).

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

66785280 is a wasteful number, since it uses less digits than its factorization.

66785280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119 (or 1097 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 66785280 is about 8172.2261349035. The cubic root of 66785280 is about 405.7204673112.

The spelling of 66785280 in words is "sixty-six million, seven hundred eighty-five thousand, two hundred eighty".