66446290 has 16 divisors (see below), whose sum is σ = 119964312. Its totient is φ = 26498304.

The previous prime is 66446269. The next prime is 66446293. The reversal of 66446290 is 9264466.

It can be written as a sum of positive squares in 4 ways, for example, as 28955161 + 37491129 = 5381^2 + 6123^2 .

It is not an unprimeable number, because it can be changed into a prime (66446293) by changing a digit.

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, 6489 + ... + 13228.

Almost surely, 2^66446290 is an apocalyptic number.

66446290 is a deficient number, since it is larger than the sum of its proper divisors (53518022).

66446290 is a wasteful number, since it uses less digits than its factorization.

66446290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20061.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 66446290 is about 8151.4593785408. The cubic root of 66446290 is about 405.0328480191.

The spelling of 66446290 in words is "sixty-six million, four hundred forty-six thousand, two hundred ninety".