66440306 has 8 divisors (see below), whose sum is σ = 99962544. Its totient is φ = 33119460.

The previous prime is 66440303. The next prime is 66440357. The reversal of 66440306 is 60304466.

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

It is a super-2 number, since 2×66440306² = 8828628522747272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66440303) 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, 49520 + ... + 50843.

It is an arithmetic number, because the mean of its divisors is an integer number (12495318).

Almost surely, 2^66440306 is an apocalyptic number.

66440306 is a deficient number, since it is larger than the sum of its proper divisors (33522238).

66440306 is a wasteful number, since it uses less digits than its factorization.

66440306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100696.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 66440306 is about 8151.0923194379. The cubic root of 66440306 is about 405.0206888786.

The spelling of 66440306 in words is "sixty-six million, four hundred forty thousand, three hundred six".