66731710 has 16 divisors (see below), whose sum is σ = 121308192. Its totient is φ = 26428000.

The previous prime is 66731699. The next prime is 66731713. The reversal of 66731710 is 1713766.

It is a super-2 number, since 2×66731710² = 8906242239048200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66731713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32026 + ... + 34045.

It is an arithmetic number, because the mean of its divisors is an integer number (7581762).

Almost surely, 2^66731710 is an apocalyptic number.

66731710 is a deficient number, since it is larger than the sum of its proper divisors (54576482).

66731710 is a wasteful number, since it uses less digits than its factorization.

66731710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66179.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 66731710 is about 8168.9479126752. The cubic root of 66731710 is about 405.6119590728.

The spelling of 66731710 in words is "sixty-six million, seven hundred thirty-one thousand, seven hundred ten".