66859860 has 96 divisors (see below), whose sum is σ = 198696960. Its totient is φ = 16751232.

The previous prime is 66859853. The next prime is 66859937. The reversal of 66859860 is 6895866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 254089 + ... + 254351.

It is an arithmetic number, because the mean of its divisors is an integer number (2069760).

Almost surely, 2^66859860 is an apocalyptic number.

66859860 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 66859860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99348480).

66859860 is an abundant number, since it is smaller than the sum of its proper divisors (131837100).

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

66859860 is a wasteful number, since it uses less digits than its factorization.

66859860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 48.

The square root of 66859860 is about 8176.7878778895. The cubic root of 66859860 is about 405.8714355886.

The spelling of 66859860 in words is "sixty-six million, eight hundred fifty-nine thousand, eight hundred sixty".