66440235 has 8 divisors (see below), whose sum is σ = 106304400. Its totient is φ = 35434784.

The previous prime is 66440201. The next prime is 66440237. The reversal of 66440235 is 53204466.

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

It is a cyclic number.

It is not a de Polignac number, because 66440235 - 2⁷ = 66440107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66440237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2214660 + ... + 2214689.

It is an arithmetic number, because the mean of its divisors is an integer number (13288050).

Almost surely, 2^66440235 is an apocalyptic number.

66440235 is a deficient number, since it is larger than the sum of its proper divisors (39864165).

66440235 is a wasteful number, since it uses less digits than its factorization.

66440235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4429357.

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 66440235 is about 8151.0879641923. The cubic root of 66440235 is about 405.0205446063.

The spelling of 66440235 in words is "sixty-six million, four hundred forty thousand, two hundred thirty-five".