66756020 has 24 divisors (see below), whose sum is σ = 144711168. Its totient is φ = 25840800.

The previous prime is 66756017. The next prime is 66756031. The reversal of 66756020 is 2065766.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53216 + ... + 54455.

It is an arithmetic number, because the mean of its divisors is an integer number (6029632).

Almost surely, 2^66756020 is an apocalyptic number.

It is an amenable number.

66756020 is an abundant number, since it is smaller than the sum of its proper divisors (77955148).

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

66756020 is a wasteful number, since it uses less digits than its factorization.

66756020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107711 (or 107709 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 66756020 is about 8170.4357288948. The cubic root of 66756020 is about 405.6612071719.

The spelling of 66756020 in words is "sixty-six million, seven hundred fifty-six thousand, twenty".