66470688 has 72 divisors (see below), whose sum is σ = 190417500. Its totient is φ = 21993984.

The previous prime is 66470671. The next prime is 66470689. The reversal of 66470688 is 88607466.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 60652944 + 5817744 = 7788^2 + 2412^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (66470689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42138 + ... + 43686.

Almost surely, 2^66470688 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 66470688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95208750).

66470688 is an abundant number, since it is smaller than the sum of its proper divisors (123946812).

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

66470688 is a wasteful number, since it uses less digits than its factorization.

66470688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714 (or 1703 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 66470688 is about 8152.9557830274. The cubic root of 66470688 is about 405.0824157836.

The spelling of 66470688 in words is "sixty-six million, four hundred seventy thousand, six hundred eighty-eight".