66047670 has 128 divisors (see below), whose sum is σ = 196116480. Its totient is φ = 15707520.

The previous prime is 66047659. The next prime is 66047671. The reversal of 66047670 is 7674066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66047671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 108507 + ... + 109113.

It is an arithmetic number, because the mean of its divisors is an integer number (1532160).

Almost surely, 2^66047670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66047670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98058240).

66047670 is an abundant number, since it is smaller than the sum of its proper divisors (130068810).

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

66047670 is a wasteful number, since it uses less digits than its factorization.

66047670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667 (or 661 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 66047670 is about 8126.9717607483. The cubic root of 66047670 is about 404.2212745619.

The spelling of 66047670 in words is "sixty-six million, forty-seven thousand, six hundred seventy".