66730872 has 32 divisors (see below), whose sum is σ = 179660880. Its totient is φ = 20532480.

The previous prime is 66730837. The next prime is 66730897. The reversal of 66730872 is 27803766.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 66730872.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106629 + ... + 107252.

Almost surely, 2^66730872 is an apocalyptic number.

It is an amenable number.

66730872 is an abundant number, since it is smaller than the sum of its proper divisors (112930008).

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

66730872 is a wasteful number, since it uses less digits than its factorization.

66730872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213903 (or 213899 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 66730872 is about 8168.8966207193. The cubic root of 66730872 is about 405.6102612081.

The spelling of 66730872 in words is "sixty-six million, seven hundred thirty thousand, eight hundred seventy-two".