66667040 has 48 divisors (see below), whose sum is σ = 171823680. Its totient is φ = 24241920.

The previous prime is 66667039. The next prime is 66667049. The reversal of 66667040 is 4076666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66667049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17180 + ... + 20699.

It is an arithmetic number, because the mean of its divisors is an integer number (3579660).

Almost surely, 2^66667040 is an apocalyptic number.

It is an amenable number.

66667040 is an abundant number, since it is smaller than the sum of its proper divisors (105156640).

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

66667040 is a wasteful number, since it uses less digits than its factorization.

66667040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37905 (or 37897 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 66667040 is about 8164.9886711495. The cubic root of 66667040 is about 405.4808899331.

The spelling of 66667040 in words is "sixty-six million, six hundred sixty-seven thousand, forty".