66404960 has 24 divisors (see below), whose sum is σ = 156882096. Its totient is φ = 26561920.

The previous prime is 66404929. The next prime is 66404971. The reversal of 66404960 is 6940466.

It is a self number, because there is not a number n which added to its sum of digits gives 66404960.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207356 + ... + 207675.

It is an arithmetic number, because the mean of its divisors is an integer number (6536754).

Almost surely, 2^66404960 is an apocalyptic number.

It is an amenable number.

66404960 is an abundant number, since it is smaller than the sum of its proper divisors (90477136).

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

66404960 is a wasteful number, since it uses less digits than its factorization.

66404960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415046 (or 415038 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 66404960 is about 8148.9238553321. The cubic root of 66404960 is about 404.9488529628.

The spelling of 66404960 in words is "sixty-six million, four hundred four thousand, nine hundred sixty".