66710688 has 72 divisors (see below), whose sum is σ = 192515904. Its totient is φ = 20211840.

The previous prime is 66710671. The next prime is 66710717. The reversal of 66710688 is 88601766.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8745 + ... + 14487.

It is an arithmetic number, because the mean of its divisors is an integer number (2673832).

Almost surely, 2^66710688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66710688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96257952).

66710688 is an abundant number, since it is smaller than the sum of its proper divisors (125805216).

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

66710688 is a wasteful number, since it uses less digits than its factorization.

66710688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5778 (or 5759 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 66710688 is about 8167.6611095221. The cubic root of 66710688 is about 405.5693622816.

The spelling of 66710688 in words is "sixty-six million, seven hundred ten thousand, six hundred eighty-eight".