66681528 has 32 divisors (see below), whose sum is σ = 166966800. Its totient is φ = 22192128.

The previous prime is 66681521. The next prime is 66681533. The reversal of 66681528 is 82518666.

It is a self number, because there is not a number n which added to its sum of digits gives 66681528.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66681521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16650 + ... + 20262.

Almost surely, 2^66681528 is an apocalyptic number.

It is an amenable number.

66681528 is an abundant number, since it is smaller than the sum of its proper divisors (100285272).

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

66681528 is a wasteful number, since it uses less digits than its factorization.

66681528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4391 (or 4387 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 66681528 is about 8165.8758256540. The cubic root of 66681528 is about 405.5102606767.

The spelling of 66681528 in words is "sixty-six million, six hundred eighty-one thousand, five hundred twenty-eight".