66700780 has 24 divisors (see below), whose sum is σ = 140264208. Its totient is φ = 26643648.

The previous prime is 66700771. The next prime is 66700793. The reversal of 66700780 is 8700766.

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, 16302 + ... + 19978.

It is an arithmetic number, because the mean of its divisors is an integer number (5844342).

Almost surely, 2^66700780 is an apocalyptic number.

It is an amenable number.

66700780 is an abundant number, since it is smaller than the sum of its proper divisors (73563428).

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

66700780 is a wasteful number, since it uses less digits than its factorization.

66700780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4593 (or 4591 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 66700780 is about 8167.0545486118. The cubic root of 66700780 is about 405.5492826396.

The spelling of 66700780 in words is "sixty-six million, seven hundred thousand, seven hundred eighty".