66707928 has 64 divisors (see below), whose sum is σ = 211776000. Its totient is φ = 19058976.

The previous prime is 66707923. The next prime is 66707959. The reversal of 66707928 is 82970766.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66707923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20548 + ... + 23571.

It is an arithmetic number, because the mean of its divisors is an integer number (3309000).

Almost surely, 2^66707928 is an apocalyptic number.

It is an amenable number.

66707928 is an abundant number, since it is smaller than the sum of its proper divisors (145068072).

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

66707928 is a wasteful number, since it uses less digits than its factorization.

66707928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44141 (or 44131 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 66707928 is about 8167.4921487566. The cubic root of 66707928 is about 405.5637690406.

The spelling of 66707928 in words is "sixty-six million, seven hundred seven thousand, nine hundred twenty-eight".