66963760 has 20 divisors (see below), whose sum is σ = 155690928. Its totient is φ = 26785472.

The previous prime is 66963739. The next prime is 66963763. The reversal of 66963760 is 6736966.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (66963763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418444 + ... + 418603.

Almost surely, 2^66963760 is an apocalyptic number.

It is an amenable number.

66963760 is an abundant number, since it is smaller than the sum of its proper divisors (88727168).

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

66963760 is a wasteful number, since it uses less digits than its factorization.

66963760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837060 (or 837054 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 43.

The square root of 66963760 is about 8183.1387621132. The cubic root of 66963760 is about 406.0815677315.

The spelling of 66963760 in words is "sixty-six million, nine hundred sixty-three thousand, seven hundred sixty".