66687020 has 12 divisors (see below), whose sum is σ = 140042784. Its totient is φ = 26674800.

The previous prime is 66687011. The next prime is 66687053. The reversal of 66687020 is 2078666.

66687020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 3 ways as a sum of consecutive naturals, for example, 1667156 + ... + 1667195.

It is an arithmetic number, because the mean of its divisors is an integer number (11670232).

Almost surely, 2^66687020 is an apocalyptic number.

It is an amenable number.

66687020 is an abundant number, since it is smaller than the sum of its proper divisors (73355764).

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

66687020 is a wasteful number, since it uses less digits than its factorization.

66687020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3334360 (or 3334358 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 66687020 is about 8166.2120961925. The cubic root of 66687020 is about 405.5213932011.

The spelling of 66687020 in words is "sixty-six million, six hundred eighty-seven thousand, twenty".