66928760 has 32 divisors (see below), whose sum is σ = 150994800. Its totient is φ = 26699520.

The previous prime is 66928759. The next prime is 66928831. The reversal of 66928760 is 6782966.

It is a Cunningham number, because it is equal to 8181²-1.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14315 + ... + 18405.

Almost surely, 2^66928760 is an apocalyptic number.

It is an amenable number.

66928760 is an abundant number, since it is smaller than the sum of its proper divisors (84066040).

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

66928760 is a wasteful number, since it uses less digits than its factorization.

66928760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4511 (or 4507 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 66928760 is about 8180.9999388828. Note that the first 4 decimals coincide. The cubic root of 66928760 is about 406.0108064132.

The spelling of 66928760 in words is "sixty-six million, nine hundred twenty-eight thousand, seven hundred sixty".