66869724 has 12 divisors (see below), whose sum is σ = 156029384. Its totient is φ = 22289904.

The previous prime is 66869723. The next prime is 66869741. The reversal of 66869724 is 42796866.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66869723) 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 3 ways as a sum of consecutive naturals, for example, 2786227 + ... + 2786250.

Almost surely, 2^66869724 is an apocalyptic number.

It is an amenable number.

66869724 is an abundant number, since it is smaller than the sum of its proper divisors (89159660).

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

66869724 is a wasteful number, since it uses less digits than its factorization.

66869724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5572484 (or 5572482 counting only the distinct ones).

The product of its digits is 870912, while the sum is 48.

The square root of 66869724 is about 8177.3910264827. The cubic root of 66869724 is about 405.8913943450.

The spelling of 66869724 in words is "sixty-six million, eight hundred sixty-nine thousand, seven hundred twenty-four".