66620240 has 40 divisors (see below), whose sum is σ = 159894528. Its totient is φ = 25787520.

The previous prime is 66620237. The next prime is 66620293. The reversal of 66620240 is 4202666.

66620240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10952 + ... + 15911.

Almost surely, 2^66620240 is an apocalyptic number.

It is an amenable number.

66620240 is an abundant number, since it is smaller than the sum of its proper divisors (93274288).

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

66620240 is a wasteful number, since it uses less digits than its factorization.

66620240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26907 (or 26901 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 66620240 is about 8162.1222730366. The cubic root of 66620240 is about 405.3859857252.

The spelling of 66620240 in words is "sixty-six million, six hundred twenty thousand, two hundred forty".