66628441 has 8 divisors (see below), whose sum is σ = 72744768. Its totient is φ = 60522000.

The previous prime is 66628439. The next prime is 66628451. The reversal of 66628441 is 14482666.

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

It is not a de Polignac number, because 66628441 - 2¹ = 66628439 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66628441.

It is not an unprimeable number, because it can be changed into a prime (66628451) 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, 24111 + ... + 26731.

It is an arithmetic number, because the mean of its divisors is an integer number (9093096).

Almost surely, 2^66628441 is an apocalyptic number.

It is an amenable number.

66628441 is a deficient number, since it is larger than the sum of its proper divisors (6116327).

66628441 is a wasteful number, since it uses less digits than its factorization.

66628441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4943.

The product of its digits is 55296, while the sum is 37.

The square root of 66628441 is about 8162.6246391709. The cubic root of 66628441 is about 405.4026194793.

The spelling of 66628441 in words is "sixty-six million, six hundred twenty-eight thousand, four hundred forty-one".