66620712 has 16 divisors (see below), whose sum is σ = 166551840. Its totient is φ = 22206896.

The previous prime is 66620693. The next prime is 66620753. The reversal of 66620712 is 21702666.

66620712 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 66620712.

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, 1387908 + ... + 1387955.

It is an arithmetic number, because the mean of its divisors is an integer number (10409490).

Almost surely, 2^66620712 is an apocalyptic number.

It is an amenable number.

66620712 is an abundant number, since it is smaller than the sum of its proper divisors (99931128).

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

66620712 is a wasteful number, since it uses less digits than its factorization.

66620712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2775872 (or 2775868 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 66620712 is about 8162.1511870340. The cubic root of 66620712 is about 405.3869431006.

The spelling of 66620712 in words is "sixty-six million, six hundred twenty thousand, seven hundred twelve".