66810772 has 12 divisors (see below), whose sum is σ = 133621600. Its totient is φ = 28633176.

The previous prime is 66810769. The next prime is 66810781. The reversal of 66810772 is 27701866.

It is a happy number.

66810772 is an admirable number.

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 3 ways as a sum of consecutive naturals, for example, 1193022 + ... + 1193077.

Almost surely, 2^66810772 is an apocalyptic number.

It is an amenable number.

66810772 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66810772 is a wasteful number, since it uses less digits than its factorization.

66810772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2386110 (or 2386108 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 66810772 is about 8173.7856590444. The cubic root of 66810772 is about 405.7720820308.

The spelling of 66810772 in words is "sixty-six million, eight hundred ten thousand, seven hundred seventy-two".