66708560 has 20 divisors (see below), whose sum is σ = 155097588. Its totient is φ = 26683392.

The previous prime is 66708553. The next prime is 66708569. The reversal of 66708560 is 6580766.

It can be written as a sum of positive squares in 2 ways, for example, as 45104656 + 21603904 = 6716^2 + 4648^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66708569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416849 + ... + 417008.

Almost surely, 2^66708560 is an apocalyptic number.

It is an amenable number.

66708560 is an abundant number, since it is smaller than the sum of its proper divisors (88389028).

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

66708560 is a wasteful number, since it uses less digits than its factorization.

66708560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833870 (or 833864 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 66708560 is about 8167.5308386317. The cubic root of 66708560 is about 405.5650498253.

The spelling of 66708560 in words is "sixty-six million, seven hundred eight thousand, five hundred sixty".