66424040 has 16 divisors (see below), whose sum is σ = 149454180. Its totient is φ = 26569600.

The previous prime is 66424027. The next prime is 66424081. The reversal of 66424040 is 4042466.

It can be written as a sum of positive squares in 2 ways, for example, as 63648484 + 2775556 = 7978^2 + 1666^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 830261 + ... + 830340.

Almost surely, 2^66424040 is an apocalyptic number.

It is an amenable number.

66424040 is an abundant number, since it is smaller than the sum of its proper divisors (83030140).

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

66424040 is a wasteful number, since it uses less digits than its factorization.

66424040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660612 (or 1660608 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 66424040 is about 8150.0944779800. The cubic root of 66424040 is about 404.9876336213.

The spelling of 66424040 in words is "sixty-six million, four hundred twenty-four thousand, forty".