66980736 has 64 divisors (see below), whose sum is σ = 197696400. Its totient is φ = 22325760.

The previous prime is 66980717. The next prime is 66980737. The reversal of 66980736 is 63708966.

66980736 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 (64).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 66980691 and 66980700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66980737) by changing a digit.

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, 6235 + ... + 13146.

Almost surely, 2^66980736 is an apocalyptic number.

It is an amenable number.

66980736 is an abundant number, since it is smaller than the sum of its proper divisors (130715664).

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

66980736 is a wasteful number, since it uses less digits than its factorization.

66980736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19404 (or 19386 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 66980736 is about 8184.1759511878. The cubic root of 66980736 is about 406.1158801130.

The spelling of 66980736 in words is "sixty-six million, nine hundred eighty thousand, seven hundred thirty-six".