66670840 has 16 divisors (see below), whose sum is σ = 150009480. Its totient is φ = 26668320.

The previous prime is 66670819. The next prime is 66670841. The reversal of 66670840 is 4807666.

It is a self number, because there is not a number n which added to its sum of digits gives 66670840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66670841) 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, 833346 + ... + 833425.

Almost surely, 2^66670840 is an apocalyptic number.

It is an amenable number.

66670840 is an abundant number, since it is smaller than the sum of its proper divisors (83338640).

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

66670840 is a wasteful number, since it uses less digits than its factorization.

66670840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666782 (or 1666778 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 66670840 is about 8165.2213687076. The cubic root of 66670840 is about 405.4885938805.

The spelling of 66670840 in words is "sixty-six million, six hundred seventy thousand, eight hundred forty".