66307640 has 32 divisors (see below), whose sum is σ = 170506080. Its totient is φ = 22733952.

The previous prime is 66307627. The next prime is 66307649. The reversal of 66307640 is 4670366.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 66307597 and 66307606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66307649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118127 + ... + 118686.

It is an arithmetic number, because the mean of its divisors is an integer number (5328315).

Almost surely, 2^66307640 is an apocalyptic number.

It is an amenable number.

66307640 is an abundant number, since it is smaller than the sum of its proper divisors (104198440).

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

66307640 is a wasteful number, since it uses less digits than its factorization.

66307640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236831 (or 236827 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 66307640 is about 8142.9503252814. The cubic root of 66307640 is about 404.7509315507.

The spelling of 66307640 in words is "sixty-six million, three hundred seven thousand, six hundred forty".