66623710 has 8 divisors (see below), whose sum is σ = 119922696. Its totient is φ = 26649480.

The previous prime is 66623707. The next prime is 66623719. The reversal of 66623710 is 1732666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66623719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3331176 + ... + 3331195.

It is an arithmetic number, because the mean of its divisors is an integer number (14990337).

Almost surely, 2^66623710 is an apocalyptic number.

66623710 is a deficient number, since it is larger than the sum of its proper divisors (53298986).

66623710 is a wasteful number, since it uses less digits than its factorization.

66623710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6662378.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 66623710 is about 8162.3348375327. The cubic root of 66623710 is about 405.3930239514.

The spelling of 66623710 in words is "sixty-six million, six hundred twenty-three thousand, seven hundred ten".